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The ultimate MPG thing to get would be a fast back.
But you have to make it your self.
The cheapest quickest mod would be a tonneau and an air dam.
The pickup bed its self is just about the worse profile you can possibly get from an aerodynamic stand point. Just about anything you do would be an improvement.
A camper top that didn't stick out on the side or above the cab would even be an improvement.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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