I haven't done a true ABA test here, but apparently something isn't right with my design. Over the last two tanks my FE has dropped about 3 MPG. I have noticed that maintaining 55 MPH sacrifices a few MPG... typically at that speed, I'll average about 33 MPG, but with the half-tonneau that has dropped to about 29-30 MPG. My last tank (with fair weather) was 402 miles @ 16.4 gallons, about 24.5 MPG. I removed the cover right after filling the tank this week, and so far I'm back up to about 33 MPG highway. Rather disappointing...
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