What highway speed proves to be the best gas milage... Gas is getting higher and higher.....

 

I heard 55

 

55 is too slow, i stick with 60

 

55 was the best in the 70s which is why the speed limit was set at that. Now I believe its around 75 for most modern day cars.

 

I don't know what is best, but I know that I get pretty good mileage with my normal cruising which ranges from 75-85. I can get about 420 miles out of 16 gallons which is 26.25, compared to my mixed city and highway driving which generally gets about 21.5 mpg

 

i put about 400 miles a week on my max... with a 3/4 tank all week...most of them highway...

 

i will say 70 - 80 miles

 

cruising at 80mph from norcal to socal gave me 26.5mi/gal, similar to nealoc's #s.

 

My 95 gets 29mpg if all hwy miles with an avg cruising speed of 70.
I doubt I could hold the speed below 70...I barely touch the pedal when I'm at cruising speed and keeping the max from cranking 80mph is a chore!

 

I would have to say 55. But most people don't go 55...

 

I have gotten 31 mpg doing about 72 mph, that way the engine is at about 3000 rpms which gives it enough power to get up hills without using a ton of gas

 

i hear after 55 is when mpg declines but u cant do that speed on the highway unless u wana get run over.

 

After a certain point the faster you go the more drag your car has and needs more power to sustain that speed. These days I'm guessing that 60mph is optimal for good gas mileage but that means it's only the right lane for you turtle boy.

 

I've hit 29-30mpg at 60-65mph. I try to keep it there to maximize fuel economy. I paid over $2/gallon for the first ever today.

~THT

 

yea i paid $2 today and it made me think. It is shifter below 2500 for me! I am go slow now it i see that it does use les gas.

there is no way i am doing 55 on the highway! looks like people said 60 - 72 was good.

 

BUMP

 

This weekend is the first weekend that I have paid over $2/galloon. Gas jumped hugely. Some places were selling for $2.13-15/galloon.

What is up with that????!!!

 

I pay $1.89, but I have to drive 6 miles to the gas station. cheapst place around merrimack valley. (I Think)

 

a buck twenty

 

huh? how? where? directions? I'll re-enact a scene from The Road Warrior and drive a tanker to the station for that price...

~THT

 

$1.99 for premium in ATL

 

lucky bastards...in LA the prices are between 2.35 and 2.55 for premium....depending on which block ur car runs out of gas.

 

No matter what type of car fuel economy is in the shape of a standard curve. The mean of this standard car is right around 55 +/- 1MPH. So, at this speed the car is the most aerodynamically effiecient and is travelling a good distance. On my last tank I got 29.4MPG from mixed driving. $2.04 for premium here.

 

You guys are lucky, I pay 2.39 por 89. San Diego is so freakin' expensive for both gas and living.

 

Correct, I read somewhere that manufacturers build the cars to acheive the optimal gas mileage at 55MPH.

Worst gas mileage? Idle.

And with the rising prices in gas, some overlooked tips to save on gas for our Maximas are: Make sure ALL your O2 sensors are working properly as well as your knock sensor. Those things, if not working, can reduce your MPG dramatically. Oh yeah, and drive slow.

 

Pretty interesting thread. Most prices here in Chicago for premium are running in the $2.35/gallon range. I flew to Oklahoma City to get my car and had an 800 mile drive a few years back. I fueled up about 50 miles before the end of OK, kept cruise at 77mph and got 500 miles on my tank...made it into IL! Now, the light was on for appx. 30-35 miles so I didn't have much more left, but I was so amazed that I just wanted to hit 500 miles. A few miles later I refueled!

 

I hit 500 miles cruising at 78 before my light came on. 95% highway.

 

Wow, 500 miles? That's pretty impressive. I've only heard of that in 4 cylinder Hondas! I've never gotton over 430.

 

I feel that the optimal mileage for highway driving and making good time is 70 to 75 mph.

I've gotten a range of 463 miles on one tank before I was modded and it'll go up with less restrictions on the car.

 

I think I win the gas price competition:
Mammoth Mountain, CA - $3.05 (Premium)
Bridgeport, CA (if you don't make it all the way to Mammoth) - $3.37

I get 380 miles to a tank, but thats with a bad Knock Sensor (got a new one coming today, thanks Jerry Rome Nissan!) and 50/50 highway-city driving.

 

On the topic of the proper speed to maximize efficiency- any object moving above a certian speed will have a bell-shaped-curve graph where you could show that power use goes from moving the objects mass to fighting air resistance. For example, on a bicycle, 80% of your power is spent fighting the wind above 15 mph, which increases more and more the faster you go. I haven't studied any wind tunnel results for a max, so I don't know what the optimum speed is... but the faster you go, the greater percentage of power is spent fighting air resistance, not keeping the object in motion.

 

Good Job, way to go!

 

It is not necessarily a mph that you need to stay at, but rather a specific rpm. You want to stay between 2500 and 3000 rpms to get optimal mpg. This is a different mph for all cars.

 

I Get 20miles/gallon Highway/city Mix

 

It don't agree because the closer you get to 3000, the worse the mileage gets. It's been talked about plenty time here on the org. Driving an auto around 3000 sucks the fuel right up. Manuals run higher rpms at every speed compared to autos so I'd imagine the best mileage for a manual would be lower than the autos.

Manuals may run closer to 3000 rpms at around 75 mph, but the autos run around 2500 rpms. I've seen the best mileage between 2000 to 2500.

 

Just stay at 120 you wont believe how little gas you use before you get to your destination. jk. I beilve that 3000 to 3500 with the correct air pressure in your tires and premium gas was what we agreed on when this topic came up last summer.

 

With my f*cked up knock sensor and other problems my car has, I got about 350 to a tank

 

That's true. I guess I was thinking of it as running at 2500 would be way too slow anywhere you go. I guess ideally, you are right though, it would be better. I suppose in my mind, I was thinking of a reasonable rpm I could logically keep my car at and get good mileage, but still get where I need to go on time.
I don't think anyone should drive at 2500rpm all the time...ha ha ha.

 

just wanted to let you guys know, my last trip.
Two days ago I had to drive for 350 miles (total, on highway) whenI got home I fill the car up, and got a average of 27.4 MPG.

My speed, I kept around 70-75mph sometimes WOT to 85mph (passing other cars)

Problems with my car:
engine light with 1008 EVAP...
brand new kock sensor.
Outside temp 60% humidity.
65F - 74F
Hope you all like my input.
gui

 

Mine is definately best as Deezo suggested, between 2000-2500 RPM's probably in the lower end of that range too.

LEMAR