Charles, give up on the airtabs, they're crap. Build fairing for your roof AC and something on the back to make it more aerodynamic there, you'll see the biggest gains. Read Orbywans thread and you should gather volumes of info from it. Ask questions there. Trust me, putting something on back to help the aero will keep you in the running for Ugly RV, but it'll put a big ol smirk on your face when the darn thing actually helps you out.
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