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I've added about 45 vortex generators to the back of my 88 Dodge RV conversion van. They are the delta wing shape at a 20 degree angle I read were the most effecient. No I'm not about to do ABA testing as it would ruin the DB sticky tape which was the most expensive part of this project. Yes it did help, I thinking .1-.3 mpg. But then this 5800# box only got 14 mpg it's first trip, with the help of this site and others it gets 17 mpg now. That's a 22% increase. It has a 2' raised roof extension (not in EPA ratings) so just getting it back to the 17 mpg EPA rating is all I might expect for now.
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Yes, 4 bikes, sold 1, all get 40mpg or greater, 05 RV Class A, gets 9 mpg, (most only get 6-8), And a 07 Honda Accord, 29 mpg, that never needs repairs like American cars....
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