These guys claim a 12% mpg gain in combination with skirts, so even if it`s 10%, it`s awesome. The design kicks ass, I like how it folds in 4 seconds so that it doesn`t impede truck loading.
I cannot comprehend why fleet owners do not put this on every single one of their trucks. Here in my "Rapist taxes R us" country one big truck costs about 100 000USD a year just in fuel.
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