I have been averaging 20.5-22.5 driving daily backs roads light traffic to and from work. Drove it yesterday 243 miles mostly highway with two full throttle blasts to the top of fourth gear and got 24.44, I have 1000 miles on mine. I have a predator with 93 non CAI tune, and SRT airbox, other than that stock.
Comuting in Atlanta 120miles a day with stop and go traffic in the evening I average 24. 20,000 miles already but hey I bought it to drive. Pypes 3" exhaust, diablo on 93, Cai with air ran from a SRT chin spoiler..:guiness: