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Why did you trade to a smaller engine? MPG?I just traded my 6.4 for a 1500 5.7. But last summer we towed a 7,000 pound 5th wheel from Wisconsin to St Louis.....did very well, but all flat ground. Got a tad over 11 mpg. Bought a 9000 pound camper and did local towing....big difference in feel and mpg. All was good, but I knew it was there and got 8-9 mpg. I don't think it was the weight as much as the height....the new camper is 15 inches taller than the old one, so there is a lot more wind resistance....
I tow a 11k 5er with my SRW 3500 6.4 w 3:73. This is my 2nd 3500 w the 6.4.
Couldn't be happier.