We've had our R/T Durango w/ 5.7 Hemi for almost 1.5 years now. Love it. I averaged about 22 mpg on a road trip to South Dakota, a month after buying it. About 20mpg this fall on a road trip to Lake Tahoe. This included interstate driving at 80mph as often as possible, from western KY to Kali. We are very happy with the engine/tranny, and the vehicle.