just picked up my 5 speed gt yesterday and had a 118mile drive home, according to my gauge thing i got 30mpg avg

 

Damm i cant get over 9-10 mpg .... but i drive 95% in the city... Are you city guys getting better numbers ???

 

Man, this is one of those topics that just won't go away.

IF you're using the on-board computer to post your MPG numbers, hang it up. And if you are using it, at least post #'s that show your avergae from fill-up to fill-up. In other words, reset it at the punp when you fill-up and don't touch it until the next fill-up. Any other use of the on-board is a waste of everyone's time. Even then, the typical on-board is about 1-2 MPG high. Hand calculation is the only way to go and then average THOSE numbers over the course of a few months, THEN post your numbers.

Even then, % highway vs city, driving style, tire inflation, road terrain and weather conditions will all play into the mix. I even see changes due to ambient temperature and humidity.

 

Doug at bamma chips told me you can't go by what the computer says if you have an aftermarket intake, has anyone checked their mileage against the computer with the JLT intake and bamma tune?

BP

 

I don't think any internal computer from a car is going to be 100% correct. The good thing is it's usually within 1-2 mpg of what it does say. I have a Granatelli CAI and I usually get about 1.5 mpg less than what it reads. So, it's close and gives us a good idea of what we're getting.

 

I always hand calculate my mileage, every single tank... I keep a running log of each fill-up. :-)

Now that I'm not driving 50 miles of highway each day my mileage has gone down quite a bit. I typically get around 18-19 mpg now, but that's probably about 75% city driving.

 

not to mention some of us have 5 speeds, so we get better mpg and power anyways. Personally i dont see why the CPU would be very wrong. Its odometer is accurate, and fuel consumption is known, its not like its guessing. a couple mpg is a reasonable error though, so when my car is floating just under 32 mpg on the highway going 60, i would believe 30 no problem.

 

Well, today my my gas gauge showed just a tad before the last mark (in the past I've been able to run it down past the last mark) and I figured on filling up at the shell next to fashion island in newport beach, ca when my car started to chug. Luckily by the time it died I had enough going to get over the hill and coast down right into the shell station at the bottom lol. Talk about not a second too soon. I reset everything after every fill up, and today when I stopped at shell I had:

288 Miles to the tank
18.6 MPG
15.5 gallons used

I was able to fill up 15.906 gallons according to the reciept.

 

Wow, running your tank empty to calculate your mileage. How... fascinating.

 

Well, we hope the odometer is accurate. 30 mpg with V8s is great. Who needs a Prius? I'd buy a Escape Hybrid or the upcoming Fusion Hybrid or Chevy Volt before I bought a Prius.

SteveO, I keep a running tab of every tank of gas mileage too. Varies according to how much city driving I do. Fun to keep up with though.