As many of you know, I have gone through many months of frustration with my 2K2 SE 6SPD due to its apparently low fuel economy. I was never getting better than 22 mpg, no matter how conservatively I drove the car (i.e. 60-65 mph). I had the engine checked twice by the dealer and even suspected a bad MAF or O2 sensor, but it appears I was wrong in suspecting a mechanical/electrical problem.
I had been running the car with tire pressures as recommended by Nissan - 32 psi all around. In the past, I've checked these pressures with more than one gauge and the pressure was always dead on. I'd bumped the pressures up to about 34 psi at all four corners a few months ago and noticed little to no difference in handling, ride or fuel economy. However, yesterday I decided to bump the pressures up to 40 psi in the front and 37 psi in the rear. Then I went on a long trip - about 150 miles each way.
I could not believe my eyes, my trip computer (which I had just reset) was reading 29.5 mpg on the ride out (this really translates to about 26 mpg) while cruising in 6th gear between 70-75 mph. I have NEVER seen better than 22 mpg no matter how I've driven the car prior to this trip. Today, on the ride back, I was driving a bit slower, about 60-65 (because of 5 consecutive sightings of cops trapping) and the computer was reading over 31 mpg! Once I got off the highway, I filled up right away and discovered that I had actually gotten (by doing the math: total miles/gallons to refill) about 27.2 mpg on the return trip.
All I can say is that I am in absolute shock. I am getting about 5 mpg better than I was before and all I changed was the tire pressures! The car also seems a little stiffer riding, actually much better IMHO. In the end the problem was a high rolling resistance in the stock Bridgestone RE92 tires with the Nissan recommended pressures.
At these new pressures the tires do not visually appear over inflated, and the tires are spec'd to handle more than 40 psi, so I do not think there is any risk of blow outs or danger. The only risk is that the center of the tires might wear faster than the outer edges, but I'll deal with that if it happens. The dollar savings I should see in the improved fuel economy will definitely make the risk of a little premature tire wear a worthwhile one for me.
If anyone else tries this with their 6SPD's, let me know how it works out!
I had been running the car with tire pressures as recommended by Nissan - 32 psi all around. In the past, I've checked these pressures with more than one gauge and the pressure was always dead on. I'd bumped the pressures up to about 34 psi at all four corners a few months ago and noticed little to no difference in handling, ride or fuel economy. However, yesterday I decided to bump the pressures up to 40 psi in the front and 37 psi in the rear. Then I went on a long trip - about 150 miles each way.
I could not believe my eyes, my trip computer (which I had just reset) was reading 29.5 mpg on the ride out (this really translates to about 26 mpg) while cruising in 6th gear between 70-75 mph. I have NEVER seen better than 22 mpg no matter how I've driven the car prior to this trip. Today, on the ride back, I was driving a bit slower, about 60-65 (because of 5 consecutive sightings of cops trapping) and the computer was reading over 31 mpg! Once I got off the highway, I filled up right away and discovered that I had actually gotten (by doing the math: total miles/gallons to refill) about 27.2 mpg on the return trip.
All I can say is that I am in absolute shock. I am getting about 5 mpg better than I was before and all I changed was the tire pressures! The car also seems a little stiffer riding, actually much better IMHO. In the end the problem was a high rolling resistance in the stock Bridgestone RE92 tires with the Nissan recommended pressures.
At these new pressures the tires do not visually appear over inflated, and the tires are spec'd to handle more than 40 psi, so I do not think there is any risk of blow outs or danger. The only risk is that the center of the tires might wear faster than the outer edges, but I'll deal with that if it happens. The dollar savings I should see in the improved fuel economy will definitely make the risk of a little premature tire wear a worthwhile one for me.
If anyone else tries this with their 6SPD's, let me know how it works out!
is at 34 all around and I get what you're getting with 40/37... wonder what would happen if I upped mine? I'm taking a 500 mile trip this weekend. I'll try it and see what happens.
Senior Member
If you are driving for economy you probably will not notice but traction drops and torque steer goes up with tire pressure in that you are in effect reducing the tire contact patch.
Senior Member
Quote:
Originally posted by ABS
As many of you know, I have gone through many months of frustration with my 2K2 SE 6SPD due to its apparently low fuel economy. I was never getting better than 22 mpg, no matter how conservatively I drove the car (i.e. 60-65 mph). I had the engine checked twice by the dealer and even suspected a bad MAF or O2 sensor, but it appears I was wrong in suspecting a mechanical/electrical problem.
I had been running the car with tire pressures as recommended by Nissan - 32 psi all around. In the past, I've checked these pressures with more than one gauge and the pressure was always dead on. I'd bumped the pressures up to about 34 psi at all four corners a few months ago and noticed little to no difference in handling, ride or fuel economy. However, yesterday I decided to bump the pressures up to 40 psi in the front and 37 psi in the rear. Then I went on a long trip - about 150 miles each way.
I could not believe my eyes, my trip computer (which I had just reset) was reading 29.5 mpg on the ride out (this really translates to about 26 mpg) while cruising in 6th gear between 70-75 mph. I have NEVER seen better than 22 mpg no matter how I've driven the car prior to this trip. Today, on the ride back, I was driving a bit slower, about 60-65 (because of 5 consecutive sightings of cops trapping) and the computer was reading over 31 mpg! Once I got off the highway, I filled up right away and discovered that I had actually gotten (by doing the math: total miles/gallons to refill) about 27.2 mpg on the return trip.
All I can say is that I am in absolute shock. I am getting about 5 mpg better than I was before and all I changed was the tire pressures! The car also seems a little stiffer riding, actually much better IMHO. In the end the problem was a high rolling resistance in the stock Bridgestone RE92 tires with the Nissan recommended pressures.
At these new pressures the tires do not visually appear over inflated, and the tires are spec'd to handle more than 40 psi, so I do not think there is any risk of blow outs or danger. The only risk is that the center of the tires might wear faster than the outer edges, but I'll deal with that if it happens. The dollar savings I should see in the improved fuel economy will definitely make the risk of a little premature tire wear a worthwhile one for me.
If anyone else tries this with their 6SPD's, let me know how it works out!
I think it has nothing to do with your tire presssure. I run 32psi in all 4. I average 22-23mpg in city/hwy driving. if i go on the longer trip (all highway driving) I got 30-31-mpg. I think your car is fine. I personally think this is a great milege for a engine this big.Originally posted by ABS
As many of you know, I have gone through many months of frustration with my 2K2 SE 6SPD due to its apparently low fuel economy. I was never getting better than 22 mpg, no matter how conservatively I drove the car (i.e. 60-65 mph). I had the engine checked twice by the dealer and even suspected a bad MAF or O2 sensor, but it appears I was wrong in suspecting a mechanical/electrical problem.
I had been running the car with tire pressures as recommended by Nissan - 32 psi all around. In the past, I've checked these pressures with more than one gauge and the pressure was always dead on. I'd bumped the pressures up to about 34 psi at all four corners a few months ago and noticed little to no difference in handling, ride or fuel economy. However, yesterday I decided to bump the pressures up to 40 psi in the front and 37 psi in the rear. Then I went on a long trip - about 150 miles each way.
I could not believe my eyes, my trip computer (which I had just reset) was reading 29.5 mpg on the ride out (this really translates to about 26 mpg) while cruising in 6th gear between 70-75 mph. I have NEVER seen better than 22 mpg no matter how I've driven the car prior to this trip. Today, on the ride back, I was driving a bit slower, about 60-65 (because of 5 consecutive sightings of cops trapping) and the computer was reading over 31 mpg! Once I got off the highway, I filled up right away and discovered that I had actually gotten (by doing the math: total miles/gallons to refill) about 27.2 mpg on the return trip.
All I can say is that I am in absolute shock. I am getting about 5 mpg better than I was before and all I changed was the tire pressures! The car also seems a little stiffer riding, actually much better IMHO. In the end the problem was a high rolling resistance in the stock Bridgestone RE92 tires with the Nissan recommended pressures.
At these new pressures the tires do not visually appear over inflated, and the tires are spec'd to handle more than 40 psi, so I do not think there is any risk of blow outs or danger. The only risk is that the center of the tires might wear faster than the outer edges, but I'll deal with that if it happens. The dollar savings I should see in the improved fuel economy will definitely make the risk of a little premature tire wear a worthwhile one for me.
If anyone else tries this with their 6SPD's, let me know how it works out!
Senior Member
Quote:
Originally posted by ABS
As many of you know, I have gone through many months of frustration with my 2K2 SE 6SPD due to its apparently low fuel economy. I was never getting better than 22 mpg, no matter how conservatively I drove the car (i.e. 60-65 mph). I had the engine checked twice by the dealer and even suspected a bad MAF or O2 sensor, but it appears I was wrong in suspecting a mechanical/electrical problem.
I had been running the car with tire pressures as recommended by Nissan - 32 psi all around. In the past, I've checked these pressures with more than one gauge and the pressure was always dead on. I'd bumped the pressures up to about 34 psi at all four corners a few months ago and noticed little to no difference in handling, ride or fuel economy. However, yesterday I decided to bump the pressures up to 40 psi in the front and 37 psi in the rear. Then I went on a long trip - about 150 miles each way.
I could not believe my eyes, my trip computer (which I had just reset) was reading 29.5 mpg on the ride out (this really translates to about 26 mpg) while cruising in 6th gear between 70-75 mph. I have NEVER seen better than 22 mpg no matter how I've driven the car prior to this trip. Today, on the ride back, I was driving a bit slower, about 60-65 (because of 5 consecutive sightings of cops trapping) and the computer was reading over 31 mpg! Once I got off the highway, I filled up right away and discovered that I had actually gotten (by doing the math: total miles/gallons to refill) about 27.2 mpg on the return trip.
All I can say is that I am in absolute shock. I am getting about 5 mpg better than I was before and all I changed was the tire pressures! The car also seems a little stiffer riding, actually much better IMHO. In the end the problem was a high rolling resistance in the stock Bridgestone RE92 tires with the Nissan recommended pressures.
At these new pressures the tires do not visually appear over inflated, and the tires are spec'd to handle more than 40 psi, so I do not think there is any risk of blow outs or danger. The only risk is that the center of the tires might wear faster than the outer edges, but I'll deal with that if it happens. The dollar savings I should see in the improved fuel economy will definitely make the risk of a little premature tire wear a worthwhile one for me.
If anyone else tries this with their 6SPD's, let me know how it works out!
I think it has nothing to do with your tire presssure. I run 32psi in all 4. I average 22-23mpg in city/hwy driving. if i go on the longer trip (all highway driving) I got 30-31-mpg. I think your car is fine. I personally think this is a great milege for a engine this big.Originally posted by ABS
As many of you know, I have gone through many months of frustration with my 2K2 SE 6SPD due to its apparently low fuel economy. I was never getting better than 22 mpg, no matter how conservatively I drove the car (i.e. 60-65 mph). I had the engine checked twice by the dealer and even suspected a bad MAF or O2 sensor, but it appears I was wrong in suspecting a mechanical/electrical problem.
I had been running the car with tire pressures as recommended by Nissan - 32 psi all around. In the past, I've checked these pressures with more than one gauge and the pressure was always dead on. I'd bumped the pressures up to about 34 psi at all four corners a few months ago and noticed little to no difference in handling, ride or fuel economy. However, yesterday I decided to bump the pressures up to 40 psi in the front and 37 psi in the rear. Then I went on a long trip - about 150 miles each way.
I could not believe my eyes, my trip computer (which I had just reset) was reading 29.5 mpg on the ride out (this really translates to about 26 mpg) while cruising in 6th gear between 70-75 mph. I have NEVER seen better than 22 mpg no matter how I've driven the car prior to this trip. Today, on the ride back, I was driving a bit slower, about 60-65 (because of 5 consecutive sightings of cops trapping) and the computer was reading over 31 mpg! Once I got off the highway, I filled up right away and discovered that I had actually gotten (by doing the math: total miles/gallons to refill) about 27.2 mpg on the return trip.
All I can say is that I am in absolute shock. I am getting about 5 mpg better than I was before and all I changed was the tire pressures! The car also seems a little stiffer riding, actually much better IMHO. In the end the problem was a high rolling resistance in the stock Bridgestone RE92 tires with the Nissan recommended pressures.
At these new pressures the tires do not visually appear over inflated, and the tires are spec'd to handle more than 40 psi, so I do not think there is any risk of blow outs or danger. The only risk is that the center of the tires might wear faster than the outer edges, but I'll deal with that if it happens. The dollar savings I should see in the improved fuel economy will definitely make the risk of a little premature tire wear a worthwhile one for me.
If anyone else tries this with their 6SPD's, let me know how it works out!
Quote:
Originally posted by ABS
As many of you know, I have gone through many months of frustration with my 2K2 SE 6SPD due to its apparently low fuel economy. I was never getting better than 22 mpg, no matter how conservatively I drove the car (i.e. 60-65 mph). I had the engine checked twice by the dealer and even suspected a bad MAF or O2 sensor, but it appears I was wrong in suspecting a mechanical/electrical problem.
I had been running the car with tire pressures as recommended by Nissan - 32 psi all around. In the past, I've checked these pressures with more than one gauge and the pressure was always dead on. I'd bumped the pressures up to about 34 psi at all four corners a few months ago and noticed little to no difference in handling, ride or fuel economy. However, yesterday I decided to bump the pressures up to 40 psi in the front and 37 psi in the rear. Then I went on a long trip - about 150 miles each way.
I could not believe my eyes, my trip computer (which I had just reset) was reading 29.5 mpg on the ride out (this really translates to about 26 mpg) while cruising in 6th gear between 70-75 mph. I have NEVER seen better than 22 mpg no matter how I've driven the car prior to this trip. Today, on the ride back, I was driving a bit slower, about 60-65 (because of 5 consecutive sightings of cops trapping) and the computer was reading over 31 mpg! Once I got off the highway, I filled up right away and discovered that I had actually gotten (by doing the math: total miles/gallons to refill) about 27.2 mpg on the return trip.
All I can say is that I am in absolute shock. I am getting about 5 mpg better than I was before and all I changed was the tire pressures! The car also seems a little stiffer riding, actually much better IMHO. In the end the problem was a high rolling resistance in the stock Bridgestone RE92 tires with the Nissan recommended pressures.
At these new pressures the tires do not visually appear over inflated, and the tires are spec'd to handle more than 40 psi, so I do not think there is any risk of blow outs or danger. The only risk is that the center of the tires might wear faster than the outer edges, but I'll deal with that if it happens. The dollar savings I should see in the improved fuel economy will definitely make the risk of a little premature tire wear a worthwhile one for me.
If anyone else tries this with their 6SPD's, let me know how it works out!
I run 39 PSI or so in all 4 of mine, and I avg 26-27 MPG. On trips with speeds at 73-79 I get 31-33 MPG.Originally posted by ABS
As many of you know, I have gone through many months of frustration with my 2K2 SE 6SPD due to its apparently low fuel economy. I was never getting better than 22 mpg, no matter how conservatively I drove the car (i.e. 60-65 mph). I had the engine checked twice by the dealer and even suspected a bad MAF or O2 sensor, but it appears I was wrong in suspecting a mechanical/electrical problem.
I had been running the car with tire pressures as recommended by Nissan - 32 psi all around. In the past, I've checked these pressures with more than one gauge and the pressure was always dead on. I'd bumped the pressures up to about 34 psi at all four corners a few months ago and noticed little to no difference in handling, ride or fuel economy. However, yesterday I decided to bump the pressures up to 40 psi in the front and 37 psi in the rear. Then I went on a long trip - about 150 miles each way.
I could not believe my eyes, my trip computer (which I had just reset) was reading 29.5 mpg on the ride out (this really translates to about 26 mpg) while cruising in 6th gear between 70-75 mph. I have NEVER seen better than 22 mpg no matter how I've driven the car prior to this trip. Today, on the ride back, I was driving a bit slower, about 60-65 (because of 5 consecutive sightings of cops trapping) and the computer was reading over 31 mpg! Once I got off the highway, I filled up right away and discovered that I had actually gotten (by doing the math: total miles/gallons to refill) about 27.2 mpg on the return trip.
All I can say is that I am in absolute shock. I am getting about 5 mpg better than I was before and all I changed was the tire pressures! The car also seems a little stiffer riding, actually much better IMHO. In the end the problem was a high rolling resistance in the stock Bridgestone RE92 tires with the Nissan recommended pressures.
At these new pressures the tires do not visually appear over inflated, and the tires are spec'd to handle more than 40 psi, so I do not think there is any risk of blow outs or danger. The only risk is that the center of the tires might wear faster than the outer edges, but I'll deal with that if it happens. The dollar savings I should see in the improved fuel economy will definitely make the risk of a little premature tire wear a worthwhile one for me.
If anyone else tries this with their 6SPD's, let me know how it works out!
Quote:
Originally posted by see5
If you are driving for economy you probably will not notice but traction drops and torque steer goes up with tire pressure in that you are in effect reducing the tire contact patch.
I have noticed a slight increase in torque steer, but since the new lower control arms were installed, torque steer has been significantly reduced anyway. I'm not really all that concerned. A 20% increase in fuel economy has a dollar figure attached to it . . .Originally posted by see5
If you are driving for economy you probably will not notice but traction drops and torque steer goes up with tire pressure in that you are in effect reducing the tire contact patch.
I get 23-24 city and 26 hwy with 42-43psi ALWAYS.
I sure wish I had a 6-speed, since all I drive is HWY(85-95mph).
Senior Member
I am going to increase my tire pressure now and see if that helps. My gas mileage is $hetty! Did the dealer attempt to replace anything?
Quote:
Originally posted by NYC2SD
I am going to increase my tire pressure now and see if that helps. My gas mileage is $hetty! Did the dealer attempt to replace anything?
Despite my complaints about the fuel economy the dealer did not find anything wrong. Nothing was replaced.Originally posted by NYC2SD
I am going to increase my tire pressure now and see if that helps. My gas mileage is $hetty! Did the dealer attempt to replace anything?