Keystone RV Forums - View Single Post

**JRTJH** · 06-19-2018, 07:16 AM

When we were towing our 34' Holiday Rambler travel trailer with our 93 F250 7.3l diesel 8' bed, we had a wedge shaped fiberglass shell on the truck. Our fuel mileage with the shell on was about 3/4 to 1 MPG better. The shell helped flow the wind over the front of the trailer and acted as an airfoil to improve mileage. That shell was "markedly taller" than typical "wedge shaped" covers. Today's "shorter shells" likely wouldn't work as well as that shell, but that's only an opinion, I've not towed with the current "not as tall" shells to have a direct comparison.

06-19-2018, 07:16 AM	#4
JRTJH Site Team Join Date: Mar 2011 Location: Gaylord Posts: 26,977	When we were towing our 34' Holiday Rambler travel trailer with our 93 F250 7.3l diesel 8' bed, we had a wedge shaped fiberglass shell on the truck. Our fuel mileage with the shell on was about 3/4 to 1 MPG better. The shell helped flow the wind over the front of the trailer and acted as an airfoil to improve mileage. That shell was "markedly taller" than typical "wedge shaped" covers. Today's "shorter shells" likely wouldn't work as well as that shell, but that's only an opinion, I've not towed with the current "not as tall" shells to have a direct comparison. __________________ John 2015 F250 6.7l 4x4 2014 Cougar X Lite 27RKS