Another update:
My coroplast construction didn't give me huge gains, but at least a solid 1-2mpg. No hypermiling in particular, just conservative driving (the tank this weekend was almost all highways/open country roads). 33.4mpg! Actually, that's pretty good, as I usually top out around 32mpg on highway trips. My butt-dyno also tells me that I'm coasting slightly better, too.
On the downside, the fender well/front wheel deflectors didn't fare well. The left one rubbed through against the tire at some point, and I lost the right one about 60 miles into my trip. I have a bit of coroplast left over, so I can shore it up, and hopefully make it last a while.
__________________
|