I have a 2008 Mustang GT/CS
I bought a Satin Silver V6 w/Pony package and traded it in after one year after craving the V8. So many friends and family have died for me the past few years I told myself "you only live once" and upgraded to the beautiful Dark Candy Apple Red GT/CS. Gas mileage is very good considering what car it is. I'm averaging 29 mpg in this thing. Possible mpg enhancements are a Granatelli Cold Air Intake, Mobil 1 oil (although I'm going back to Motorcraft Synthetic to see if it does the same on MPG) and pumping my tires to 38 psi.
Until it was broken in I was getting around 25 mpg. The 29 I'm averaging now is mainly the past 5 months of traveling to my previous home town many times that's 125 miles away and the driving is 90% highway. I drive in between 55 & 60 mph. I may try a Brenspeed tune if they can sell me a tune that helps mpg. Also am thinking of installing NGK or Halo spark plugs to further increase mpg.
The Silver V6 had one off and on problem when I traded it in. It would stall sometimes and I never got it checked out. The V8 has been flawless, smooth and a great, comfortable ride.
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