I've got an '01 convertible with 53K miles. It's my economy car and gets 28 mpg. It's stock and has enough power to get most people in trouble, including me. I had a '69 Firebird with a built 400 and close ratio 4 speed and the vette would greatly embarrass it in all performance categories.
Mine also does the same thing in hot weather.
Another question:
I have a 2013 f150 ecoboost and the air conditioning is my only disappointment. It cools the truck after a while, but doesn't to blow very cold air. My GMC would make you want to put a jacket on if you left it on high.
Anyone...