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You know, that's a good point. Skirts on OTR trailers took far too long to 'take off'. haha Probably because fuel costs weren't enough for fleets to justify the expense for the small incremental increase in economy. But if you look around, there're a lot of them out there now. Particularly...

Interesting. I wonder what the results would be with warmer ambient/intake air temps. I caught that comment about it "adding a liter"... I just have to be think if this was a thing everybody would be doing it? Also, it likely adds quite a bit to engine idle/cool down post-travel. As they also noted.