when it's brand new the computer is still learning so your mpg will be way low.

after 2000 miles, it is much higher. i started out averaging 12.7mpg my first tank. now i'm over 20mpg and i only have 3000 miles.

 

Thanks, but I bought mine used with 7k miles on her... so I would have thought the computer would have learned by now!!

 

Reset the MPG indicator when you fill up with gas, it could just be that it wasn't reset last time and has gotten "confused". I always reset my tripmeter as well although I don't know if that matters for the computer's MPG calc.

 

+1.
It looks like you just need to reset it.

 

haha your doin better than me and i have a v6!

 

Just calc'd mine and I am getting 20.5; pretty surprised by that - I thought it would be lower.

 

I get 20 to 21 in the city. I have not tried highyway driving yet. I have a 5 speed manual v8 also. One thing you need to watch for is try not use the gas that is made from ethonol. You will see a drop in MPG using this.

 

I average around 19mpg, if that helps. It's been said before, if you have a heavy foot..your mpg will suck.

 

I average about 16-17 miles per gallon. And I'm still trying to get that number even lower! Haha

 

+1
I didn't buy my GT for fuel efficiency, but coming from an under-powered, overweight 4 door mini truck(which got about 15 overall), my 'Stang is a econo car(about 17-22 overall avg). I am not gonna complain.....car's too sweet to bitch about it. IMO