if your a self employed trucker... a new rig ain't gonna be cheap. It's like buying a new prius, or stick with the old beater. how long will the gas save you to make up for the 20grand you spent on the prius?
I think that modding the back is a bad idea. if you boat-tail, people in miata's and small things will get in there and tailgate... that' ain't gonna be pretty. The best bet is to smooth out the front and get rid of Cd there. as well as some frontal area drag.
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