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I topped off the tank for the return run and pulled 39.96 mph at a maximum 60-mph.
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That's the territory HotVWs were in with their Mileage Motor. I've got a 1200 mile road trip coming up in September. Worst case (for planning) 60 gallons at $5/gallon, or $300. If I got 40 mpg that's $150 less so my budget for imprevements should be about that.
Maybe a diverter and difusser in PolyMetal. I've been thinking a front splitter could have things like winglets on either side (like airliners have now) to act as air scoops for an air curtain on the front wheelwell. There are boltholes in the ends of the front bumper that could be used for support. The diffuser would have two oval holes for the tailpipes to stick through.