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Originally Posted by MetroMPG
I'm betting the air tabs made no discernable difference.
Great mods!
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Thanks! The DIY AirTabs... hard to say what if any difference they made. When I first installed them, there was a lot of noise, but no real difference in how the car handled. At least as far as I could differentiate from the belly screen that I was fiddling with at the same time. Now, I did see a consistent 1 mpg boost when I cut them down from 2.5 inches to .75 inches and better handling. But again, I was finishing and repairing the belly screen at the same time. You could say "I want to believe" that they should work on my truck. The vacuum suck when I shift to N downhill is hugely frustrating, and it would be great to minimize that. Maybe they need to see a wing. It's a fact that my short bed doesn't allow a shallow 12 degree angle -- it's more like 20. Soon I'm thinking I might experiment with a whale tail. But first I'll see if managing the angle of the roof and sides can accommodate the short 5-foot bed.
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I'd definitely work on that coroplast taper to the roof & side of the cab. You can't go wrong with a 10 degree taper (sides & top) if you just want to slap something together.
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Yeah, "slap" definitely describes this last mod. It's not even a bonnet -- more like a kerchief. Ideally, if I wanted to stick with this mod, I think I need to make it look like a manly backwards baseball cap.
I'm having trouble imagining how to apply the sides-taper to a fastback attachment, that I assume would affix to the bed rails, when my bed is wider than the cab. Is there a model somewhere for this? Or maybe the idea is a gradual taper as it rises towards the top...