Did a similar run (night, freezing weather, slight drizzle, same road) tonight and got 25.6 at 70 mph.
I think that Its catching in some places and doesent have attached flow in others. Definately could be better. I was willing to compromise for the indicator lights but 4 feet for 1 mpg isn't good enough.
Can some of the aero guys tell me if I made it too steep? The always classic Pythagorean Theorem tells me its 13 degrees top and bottom. SO I don't know.
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