I am also surprised at the mileage a Miata returns. I trust the Suburban is right-sized for your needs.
Scanguage ==> Knowledge is power.
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Also, I'm very interested in trying to get rid of the vacuum created off of the back of the suburban.
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How much pain are you willing to take on? 4 feet more overall length? 2 feet? 8 inches?
A bug deflector isn't going to move the air needed. You could look to the trick they use on big rig box vans:
Everybody likes coroplast, except me. Look for Polymetal/Alumipanel/MaxMetal type aluminum skinned thermoplastic sheet. I've only worked with samples, but I haunt the local recyclers waiting for a piece big enough to do at least a diverter/front partial pan.
It's 3 or 6mm thick with .007" skins, is about as stiff as 5/8 plywood at 1/10th the weight. It's sold for signage and used for the big billboard sized wings they put on dirt-track circle racers.