so this past weekend went on a trip from central NJ to Buffalo, NY and back. put on about 850 miles in two days. this trip was on snow tires, in the cold, and I drove in a spirited manner. mileage was about 29mpg. this summer I did the trip on summer tires, nice weather, and drove conservatively. mileage was about 32mpg. have to say that, despite the snow tires, this trip was more fun for just a 10% "penalty". the ZHP (stock) can growl pretty good.