Originally Posted by BigBlueEdge
I've had a HEMI for over 5 years. The mpg varies greatly depending on driving types. If you are driving around town or commuting in a metro area the mpg SUCKS (12-14). If you can get out on a highway and keep it under 70 you can approach 19. Push it into the mid 70s and you're back to 14. It is the continual slow/go acceleration that kills mpg.
I got 14+ mpg around town over the first 3k miles, 25-45mph driving with frequent stops and frequent foot to the floor hemi fun. But I also use cruise control around town whenever possible.