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When I first got the truck I drove it back from Washington D.C. to Blackwell, Oklahoma and I was getting around 17 mpg. Then I put the tail gate down and got a little over 18 mpg. That’s going around 70 to 75 mph and a stock 2003, 1500, 4.3L, auto, reg cab, long bed.
 

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in my 4.3L i got around 16-17, with my 5.3L i get around 16-17 lol
 
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