[laack]

bam- I have to add that I drove around for about 150 miles with out the top panels of my cap and saw a similar drop. There are many variables that would play into my limited results, however they were negative gains in relationship to my baseline of "no cap."

My baseline average mpg lately with the sub zero temps was 21mpg (same station same pump calculations). open box with sides of the cap only resulted in 19mpg (same work route, same time of day/traffic driving style).

2 tanks of the fully assembled cap were 24.35 and 27.2mpg (again same pump same station). temperature fluctuations lately are largely in part of the difference in economy. the first tank averaged sub zero ambient temps with snow covered road and slower traffic. the second tank saw 20 degree weather, calm winds and clean roads.