The last month or so, my gas mileage has been unbearable. I have an 02 max, with 37k miles on it. I recently swapped intakes from a Frankencar to an Injen. And I haven't been riding hard. Would the intake have anything to do with it? I've checked for leaks, and it's all on tight. I'm currently getting from 180-210 miles a whole tank, and thats with the gas light coming on! And I've also gone a whole tank without actually getting on it, and I got 227. This is unacceptable, with the prices gas is now. I'm also using premium gas, from 6 different gas stations, all with the same results. What should I check guys, I just got a tune up 2 months ago.

Thanks in advance.

 

Kind of coincidental that your gas mileage went to hell after your tune-up, huh?
Sounds like you should be talking to whoever gave you your "tune-up."

 

Could be many things. I was getting about 10-12 mi/gal, until I changed my spark plugs. My mileage is in the 20's now.

 

Try shifting out of first gear.-j/k

 

Make sure all your connections on the Injen are tight. Also, post up what they did for the tune up.

 

I dont understand why you got a tune-up, on newer cars all they really do is change the spark-plugs, maybe a plug is gapped wrong or a wire is loose. Also try putting the stock air intake back on and see if it changes.

 

I average 225 miles a tank also. Its been that way since day 1.

 

Dayam!! Maybe my 3-liter manual will get better trade-in value vs the 3.5 liter cars when gas gets to $3 bucks later this year....

R U running with your A/C on??

Lowest I've ever had on my mixed city/back roads commute was 277 miles to the gas light coming on, average is 305 to 325, highest was 382 miles driving up to Seattle for the Northwest Nissan meet -and that was not a slow caravan....

 

I had average of 18-20 Miles to a gallon with most local and some highway driving, and this was when my SES light came on (3 bad O2 Sensor)

After I had it replaced my gas miles went up to 22-25 miles to a gallon.

 

I just had a tank where I got 31.15 mpg, but let me tell you, it was painful to accomplish. Driving 65 on cruise on the highway in 6th gear for a couple days on my 150 mile round trip commute to work (all highway).

I've got the details on this post:

http://forums.maxima.org/showthread....2&goto=newpost

Where I'm taking data on peoples mileages so I can come up with an error factor on our trip computers.

 

Thats a good idea and see EXACTLY how the hack the MPG computer on our cars gets the reading?!

I never look at the MPG computer anyway, I just reset the trip meter everytime I fill up gas and next time I get gas I use this equation to get a more accurate MPG. (Trip meter/ Gallons fill up= MPG)

I one time got 400miles from a whole tank, this was achived one time:

*During breaking period
*shifting at 2200RPM everytime
*95%highway @ 65MPH (No traffic at all) 6th gear
*Only use Premium gas
*Drove until GET GAS light turn on, after it came on I drove another 20miles to the gas station
*By this time DTE(Distances till empty) reads 15Miles

It was scary, i thought I'm going to be pushing car or something....I would never do it again..