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Dang, thats brutal gas mileage.
I get about 20 at highway speeds in my 6.0L desiel Ecursion. It has a small psuedo spoiler looking thingy on the front, but nothing on the rear.
I also notice a difference in mileage between 70 mph and 80 mph.
Have fun on your trip, I have done the drive to northern ca from Denver (I actually went north through Laramie, WYO) and really enjoyed it.
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