Mine is about 15-16 in town and and 20-24 (depending on traffic/hills and speed. I've gotten 26 before going 70-75 but that was flat and little traffic) on the highway according to the onboard. Reality is usually a mpg or so lower. I also drive it hard in town.
ETA: Mine is a 06 R/T with the Road and Track package(daytona without the colors and stripes) stock 18" wheels and 235/55R18 tires
Only modifications on mine are a billettech oil catch can, K&N panel filter.