I have found the wind the trailer is pushing behind your truck is the reason for low gas mileage. I see from most of the posts here the smaller TT trailers are giving an average of 9-12 MPG pulling the similar small size TT trailer....
My OFF-ROAD Starcraft 14RT POPUP trailer gives me around 19MPG or so being pulled behind my 2010 F150 truck. The POPUP is almost completely hidden behind my truck and is the reason for the good gas mileage. This is almost the same gas mileage I get without pulling the trailer.
My POPUP trailer weighs in around 4200 lbs loaded down with all my camping junk but when cranked down in travel mode position offers very little wind resistance when being pulled behind my truck. For some strange reason I get my better gas mileage using the SHELL OIL gas products...
Roy and Carolyn
I claim Horse Creek Country in Southern Ill - Momabear is from North Texas
We live in King George VA
RETIRED DOD DOAF DON CONTRACTOR Electronics Tech 42YRS
"We're burning daylight" - John Wayne
2008 STARCRAFT 14RT OFF-ROAD POPUP with PD9260C and three 85AH 12VDC batteries
2010 F150 FX4 5.4 GAS with 3.73 gears - Super Cab - Towing Package - 2KW Honda EU2000i Gen
K9PHT (since 1957) 146.52Mhz
"We always have a PLAN B"