07 5spd GT Getting 15mpg

[busterc]

I get 21mpg on the highway with all my mods (460'ish rwhp)

 

[cLeAnRaCiNgLdR]

15-17 city
22-24 highway

I shift around 25-2600 usually

get on it about once a day

not bad.

 

[V8JamesGT]

I get 16-17 in the city and 27-28 on highway w/ cruise control set at 65mph

 

[89llx]

My 68 GT with a 428 CJ, 4 speed and 3:90 gears got 11 mpg and it was only 335 hp, so I'll take 22 mpg at 300 hp, at least for now. I haven't had it on a trip yet, but I expect it to get 25 or 26 mpg.

your 428 was under rated, NHRA rated the motor at 400 hp, it did not feel like 335 hp ,did it?

 

[jmuva44]

You will only ever get the advertised ratings if you minimize your RPMs, skip gears, utilize 5th gear and are smooth on the gas pedal, the break and steering wheel. You are not going to drive it like you stole it and get 25 MPG.

 

[jmuva44]

I had my car up to 27.5 MPG on a 30 minute trip down the highway. But i was driving behind my friends who drive like grannies.

 

[mustangdave]

I got near 30 on a long trip at between 65 and 70 m.p.h. Mixed driving gets betwee 19 and 23 depending on how aggressive I am. I checked the computer against the actual math for two months and it was always within 1/2 m.p.g.,so it is accurate enough. I also did one month of ethanol free gas compared to one month of gas that contained up to 10% ethanol: no difference in mileage.