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I leave the camper on my truck even when I go 35 miles to PIR for a 6 hour Wednesday night race. It only makes about 3 MPG difference and I don't have to walk a 1/8 mile to the cans 20 times a night. I'm not 25 years old anymore. 
Plus if it's hot out it's nice to go in the camper once in a while to cool of with the AC.
My camper makes NO difference in MPG. I get 7 MPG towing, hauling, cruising,,,no matter what!!!  I have found /cured a few problems to get it UP to 7!!! 
If you like drag racing, support your local track.
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