i just went on a trip last weekend and out of the 3 tanks of fuel i got 25.8, 30.5, 27.6 miles per gallon each.
I'm all stock on a 02 GT 5 speed.
the 30.5 mpg came from flagstaff to page and back to the grand canyon. all at between 5500 and 8500 feet in elevation and running anywhere...