Just did 2 kinda long trips in my 4.7 4x4 ram. Got around 16.5 both trips. Around town and to work I average 13.5 but I usually drive it a bit harder then. FYI its got exhaust and a intake on it and plugs are due.

I get between 9 and 10 towing a rockbuggy and trailer which is roughly 5000lbs.

 

Most of the problem is the Ethenol that is in the Gasoline.Since it's been in use mileage has dropped 10 per cent.