Any car has lemons. not JUST this model.
Gas mileage for the SVT CAN be as high as 25/32-ish.
normally, if you drive it a little heavier you'll get about 21.5-ish/28
Alternator's go out alot.
WATERPUMP is the BIGGEST problem you will likely face. change it out immediately with a revised white impellar, or metal impellar (not the black plastic it has currently... )
Oiling issues, but running 6.5 qts, and taking it easy on certain aspects can help alot.
Ray
