My Challenger is still my daily driver, after about 5 years and over 40k miles. It has a pretty stock 318/904 in it, although I added a 4 barrel and headers and I run 3.23 gears out back. With that set up I get around 12mpg in town, and around 15-16mpg highway. I drive it like a musclecar, so I know I could do better in the mpg department if I lifted a little. :D