Re: 2012 5.0 mpg ?
I recently bought a 2012 Kona Blue Mustang 5.0 with the 3.73 gears and the 6 speed manual. I've got about 1,200 miles on it now. I bought it as a commuting car for the mpg. No seriously! I actually cross shopped an Audi A3 TDI! OK, OK, I do have other criteria, and the Audi was just way to slow. But considering my other vehicle is a 13 year old 3/4 ton truck (~15 mpg locally and 18 highway @ 65 mph) , 26 mpg highway for the 5.0 looked real good and I fell in love with it on the test drive. Nothing wrong with wanting decent efficiency in a car that's fun to drive.
So what does it really get... Here's my experience so far.
Spirited driving on country roads - ~16 mpg (spirited means I could smell the burnt rubber when I got out after a drive and mpg was still better than when babying the truck)
Enjoying the engine but not smoking tires - 18 - 22 mpg on country roads
Cruise control at 80 mph with rolling hills - 23-24 mpg
Cruising control at 60 mph 95% flat road a few bridges - 28 mpg.
There's quite a range. I don't think I can do better than 28 mpg. I'm sure I can do much worst than 16 mpg (like if I were on a track).