mike25

if some people have a hard time believing the dic mpg reader then try this. the car(or at least the 2.4 in general) should attain around 360mpg at least each tank. if you want to follow it and make sure your getting it, just keep an eye on your fuel meter. per ever quarter of the gauge you should average 90miles, and if your not adjust your driving accordingly. even so, if you want you can break the 90 own into 45 and go every eigth of a tank and so on. i started doing this and i can keep my driving habbits in tap and ive pulled my 300mile tanks of gas into a 350-360 mile tank

most of you probably already know this but this is just from my own personal experimentation

krispy

Not a bad idea, but from my experience fuel gauges arn't always accurate [I think it even states this in the manual], especially as they age, the contacts on the arm in the tank can get contaminated. I also notice that the position of the needle changes from when I turn the car off and when I turn it back on sometimes.

D4u2s0t

the fuel guage is not accurate enough to do that. mine will stay on full for about 2 days, then go down very quickly.

slick54

pffft mines all messed up i go on low fuel for like a whole day

krispy

Yea, like I said before the contamination in the fuel on the contact can do that. I have read of warranty cases w/ fuel gauge problems where GM Fuel System Treatment Plus fixed the issue.

http://paceperformance.com/index.asp...&ProdID=172753

The 94 Z28 I used to have had a very fun gauge due to its age. Full tank = 1.5x F on gauge. 1/4 tank of fuel = 1/2 F on gauge. Empty was empty...no safety zone.

Apcsox

seems to me like the first half of the tank goes very slow, and then the second half drops very suddenly

mike25

the dic is not adjusting to actual fuel in the tank, instead the computer is calculating how much fuel is in the tank based on previous mileage, speed and actual distance gone. its constantly readjusting because of this. also, my method still works because at the end of the tank if i look at distance traveled on trip b it still comes up 350-360

CSM Huber

I thought the DIC computed miles per gallon based on the duty cycle of the injectors and their flow rates versus the speed of the vehicle, miles traveled, and perhaps one or two other things. I know that I can fill the tank, reset all the info in the DIC, ease out of the gas station, coast a bit in the first mile or two and get the mileage up to 30 MPG then stop at a light with the trans in Drive and the engine running, watch the mileage drop to 24MPG. During the first 10 - 20 miles coasting with the engine idling increases mileage dramatically while a heavy right foot decreases it rapidly. As the mileage increases since the last reset coasting or getting on the gas has a lesser impact (percentage changed is smaller overall).