@ace72ace

That's so weird to see two different prices for gas. Cash and credit WTH

 

Very common around here... :-P

 

I get 21ish on long freeway drives with 3.73's doing 75 - 80 so you numbers make all the sense to me. However daily driving comes in around 15... sucks! And, that's with very very little aggressive driving. If I'm really enjoying on ramps, passing and back roads... 12's.

 

Eric, I see in your profile that you also owned a 2005 GT. If you can remember how big of a difference was the fuel economy in your 2005 while stock (if you bought it that way) compared to your current 2011 while it is/was stock?

Im on the fence of what to buy as my next Mustang. I'm finding great deals on 2005-09 GTs... but it's going to be a daily so i'm curious if it's worth springing the extra cash for a fairly equal 2011 V6

 

I'm not Eric and I can't speak to the 05-09, but the '10 is probably pretty close -- you can see from my signature that my car is basically stock, with the 3.31 gears . . . (the octane, tune, and UDP's don't seem to make much difference; I got the same with the Roush CAI and 87 as I do now with that other stuff)

and I can tell you straight-up that I get 26.5-27.5 real world round trip including everything on my half-highway, half back-roads cruising commute. This is according to the computer and also verified the old fashion way several times. Once I add in some around-town driving it comes out to about 26 during the weeks when I am mostly commuting. My commute is roughly 25 miles highway at about 70 MPH plus about 25 miles cruising at 40-50, very few stop lights, no stop & go. I generally drive pretty easy with the flow of traffic, but do take the opportunity to have some fun on the on-ramps when possible. Based on what I know about my own driving habits and results, I doubt you can do much better than this with the 4.6 V8; but 26-27 ain't too shabby!