LithiuMax

I think something may be awry with my gas mileage, especially after setting my tire pressure from 45 psi to 33 psi. I am sure that has something to do with a slight drop in MPG, but I haven't gotten more than about 275 miles a tank, and that is with about 20-25% freeway driving. I do drive the car pretty hard, taking it up to and sometimes past 5k RPM, but still, I don't think this is normal. For instance, I filled up 4.5 gallons on Friday night. It is now Sunday afternoon, 70 miles later, and I have the DTE flashing as "-----", so it's even past the "xx miles" stage. Is this normal? Like I said I drive fairly hard, but would it make that much of a difference? I have a 2K3 automagnificent with ~6700 miles on it.

NYC TAR

iTrader: (2)

that is normal, maybe you put winter gas in you tank ( it is supose to burn cleaner and the trade off is lesser gas mpg. it is required in some state as a law. becase there no tree to suck up the carbon co2.

trey

Yeah, i get about 275 per tank also.

LithiuMax

Where are all the "500 miles per tank, constant WOT, 200% city driving" people to tell me otherwise? I am waiting...

Anuj

I used to get 16 mpg then I reset my ECU...now it's 20-23 mpg

C430

Well, you can change you driving habits for a while and check for economy improvements. I you drive moderately and get 28-30 MPG, you'll know the answer.

Zero Deuce SE

Winter gas in Frisco, CA? I don't think it gets cold enough there for winter blended gas.

irish44j

iTrader: (38)

I'vehad the car (2k SE 5sp) for about 6000 miles now....gotten a pretty consistent 22mpg (probably 50-50 mix city/hwy now), stayed about the same after putting Frankencar intake on....last tank was 23mpg after putting BG44K in.....I would probably get about 24-25mpg if I took my roof rack off....it adds alot of wind resistance. And I drive "assertively" if not "aggressively"

Cdriven

I notice that the Max gets lower gas milage in cooler weather. I filled my tank on saturday, and the trip computer said that I was getting around 26 mpg since my last fill up. But when I calculated it myself, it came out to be around 23 and some change. Seems to be a fairly big difference in what it calculates and what I calculate

Zero Deuce SE

It's a known fact that cars get lower fuel economy as the ambient temperature drops. It requires more energy to atomize gas when it's cold. Also the states that use winter blended gas for the winter always give you lower gas mileage.

TXT-1

iTrader: (1)

Trip computer is almost as worthless as the automatic headlight setting.

Zero Deuce SE

I suppose you're right. I don't use either one of them.

limsandy

iTrader: (1)

When your mpg drops, it's probably time to check your maintainance. Changing air filter and changing motor oil can sometimes improve your mpg dramatically. Good luck.


~limsandy

trey

I"m not saying that this statement isn't true but is there any truth to this? Has anyone else experienced better gas mileage after resetting the ECU?

I'm jus asking because i reset my ECU and seen no improvments.

nytrida

i reset the ECU...no gas mileage improvements at all...just no lag or hesitation problems...droping you're tire pressure by 12 PSI would cause a drastic decrease in your gas mileage...you have to sacrafice more gas for better ride quality...

2001SE

not only ride quality, but when you put too much PSI in the tires, it rides on the middle of the tire, and that wears it off faster, and you dont get a 100% traction of the tire on the road.

DonGfun

iTrader: (19)

I get 21.5MPG mashing it all the time

ablythe

I filled up on 87 octane and took a long road trip from Dallas to Austin and back. I drove the car all the way down to E and filled up with 16.56 gallons. My trip was at 428 miles. I was in 6th gear almost the entire time. 25.8 mpg. 95% highway miles.

JTMAX03

iTrader: (6)

how many PSi do u guys have on your cars I put 32psi . Will that help if I raise if I put more air in the tires?

desperado_45

You will never get as high as 30 mpg. He is the reason - when cars are tested for mpg they DONT USE GAS. They use some higher octane ethonal mixture or something like that, plus its done in a lab with ideal conditions. So you should be about 5-8% lower in terms of MPG.

CCx

iTrader: (2)

30?? jesus, if i got 22 i'd be happier than a pig in isht....

Anuj

yeah it worked for some people in this other thread and it didn't work for others...it's weird

I am happy it worked for me though because I was getting very mad about the mileage

1TyteMAX03

I avergae about 350 miles till the gas light indicator starts blinking.

Zero Deuce SE

I can't ever remember seeing my low fuel warning light. When I bought the car, the tank was full. I went as far as 380 once and it took 14.4 gallons to refill the tank.

badabing

My gas mileage sucks, too....and I don't know how you some of you guys drive around with less than 40 psi in the tires. My car feels like it's rolling on the tires when I try to corner and is not very responsive.

I've been trying many different things to get the gas mileage up including "babying" the car. I've concluded that this car - with 14K on it - is built the way it's built and in the area that I live in, it's damn near impossible to do any better than this. I can expect about 21 or 22 mpg and I just have to live with it.

Also, when you reset the trip computers, the car is calculating the mileage according to engine speed and fuel consumption. Technically you aren't resetting the ECU, you're just resetting the trip computer - which has no bearing on the how the car functions.



- badabing -

limsandy

iTrader: (1)

Are we talking about the same thing here? Resetting the trip computer is very different than resetting the ECU.


~limsandy

Ferbs02SMMax

yeah, no kidding. resetting the trip comp is a whole different ballgame. resetting the ecu might take you an hour if you're not careful.

joebrez

Under 40psi??? Ever driven in Chicago area man. Anything over 32psi feels like I am riding on Rocks. Everyone here needs to understand that Nissan recommends 32F32R for a combination of Ride, Handling, Gas Mileage, tire wear, as well as body integrity. I average (Trip Average, so actual is alittle lower) of 27 Mpg. When I got the new tires put on, they put 40, and my gas mileage went DOWN to about 19MPG. The only thing I can attribute it to is rolling resistance. By theory More air would equal less RR, but moving my tires back to 32psi, my MPG went back up(27).

I have found (On Stock Rims and tire size) that unless participating in a competion (AutoX, drag, etc..), Nissan's recommendations have always worked great (I have owned 6 Nissan's). And have actually had people who have blown Struts and prematurly replaced springs due to Tire Pressure being to high. Remember that Nissan factors in the tires absorbing capabilies when calibrating the suspension...

For those who live in Warm states, this does not effect you as much, but those in areas the get Snow/freezing temps, should be able to relate to this..

Joe

Dave Jr

I have to agree. I keep my tires inflated to the 32-33PSI mark also and have best results here. I had an issue with gas Mileage and hesitation a few months ago. I followed the instructions to reset the ECU and all was good. I average 23-24 miles per gallon. And I drive my car pretty hard. drive time in city on hwy is 50-50. But then again I do like the accelerator so I don't think it makes a difference.

So I think there are some awesome suggestions here. Check Tire pressure, Reset ECU and yes make sure the Air Filter is clean and up to par.