Okay, my vortex generators were apparently more effective than I thought they would be. Consistently, I just recorded two back to back record fuel mileage days doing the same 80mph speeds on the same route. Even going directly into the wind I'm getting well into the 40s where before I'd be in the 30's. Going with the wind is better too, the window in the back seems to stay a bit cleaner too. I think I'm going to make something like the toyota prius TRD roof garnish, but a bit smaller as it's become apparent that I can use the small window bubble down effectively to achieve the result I want.
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