Gas Mileage Hollaaaa

[Chris28]

So I drove back to school Sunday afternoon. Left with 3/4 tank, got here with 1/4 tank. 235 mile drive, 15 7/8 capacity tank.

After using quantum differentiable equations to figure things out, I got 29.6062992 miles per gallon. I got into boost a few times, nothing too major though. I was also stuck in traffic for about 45 minutes.

I'm actually quite surprised by this! I know I get pretty good gas mileage, but I never thought it could be this high. If I didn't hit that traffic I bet I'd be in the 30's.

Most that frequent this forum know what my setup is, but for the newcomers who might actually search it's 370cc injectors, t28 turbo, and an EFI Specialist tune.

I'm sure there have been threads like this before, but has anyone else actually calculated what mpg's they're getting? Don't forget to list your setup as well, the thread title should be search-friendly so hopefully others in search of mpg info might see this.

[eazye2000]

I got a little over 30 with my 2860RS on my ****** tune.

Then the 3076R went in, and I went to town tuning it myself. I still get about 22-24 at best. Usually about 18 now when I'm beating her like she owes me money.

It does suck because it's my daily driver now. I used to not really care, but now I do... eh..

[ghx407]

22-24 MPG (8.8 CR, 740cc inj., T3/T4, EFI Specialist tune)

[trackslut240]

stock motor t25 610cc (scooby) z32 maf, emance tune, 3inch ebay exhaust... no matter how i daily drive get about 24~25mpgs. heavy wots do drop it down to 22.thats low too low...i might have other issues but i am not ruling out the ecu tune itself.

got a retune from him after three months of wait, hopefully my first and last retune. will install that and see, time to reread on how to tune the bikirom.

[ppctx]

I dont think you can rely on the gauge needle as an accurate measure to calculate your fuel usage. Kind of like when you fill it all the way up, it take a good number of miles before the needle will even get down to the full tick and once it hits the empty tick, you can still drive for a while.

100% accurate, fill the tank, zero you mileage (assuming speedo reads the correct speed), drive for some length of time, go back and fill your tank back up. Divide the total miles driven by how many gallons it took to fill it back up.

[trackslut240]

thats accurate enough i'd say. how i check is fill up tank to first click and then dont top up, reset trip to zero, drive around and then refill tank to first click. divide miles by gallons.

chris i think you need to redo your quantum diffrentiable equations and follow ppctx and my method, let me know what you get.

[Chris28]

Haha yeah it probably isn't exactly accurate, but even if the needle doesn't start moving for a while that means it would move "faster" near the end of the tank, so by starting at 3/4 tank and ending at 1/2 tank I'm assuming I used about a half of a tank.

But yes when I go home for the summer I'll fill up right before I leave and re-do the test to see what I get.