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In dollars and cents, that means, for one of my expo trips (~200 miles give or take), the savings with the gap filler or the slower speed is less than 1 gallon of gas.*
Cheap gas seems good, but as prices go up so will returns from aero mods.
i commend you on your gap filler, and it showed positive results. Just imagine an optimised setup, with other mods helping.
I have a similar truck and trailer setup - old gmc sierra pulling 6x12 single axle. Check it out
http://ecomodder.com/forum/showthrea...p-30843-3.html
aerostealth has done some pretty cool work on aeromods for pulling trailers