[aerostealth]

This is our new 5th wheel (a 2012 Keystone Cougar). The frontal area is basically 97 sq ft, but the rear reduces down to 65 sq ft from the manufacturer. I have looked at a 4 ft three sided panel boat tail using 4 ft x 8 ft x 1/2 inch foam board and it looks possible to reduce the wake area to 37 sq ft. If my towing arrangement gets 8 mpg stock such a boat tail should improve the mpg to 9.76 mpg. that would be a 1.22 x improvement.