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I have a 05 Dodge CCLB 3500 single rear wheel 6 speed. On the highway it will all most break 20. Hand calculated it comes in right at 19.97 most of the time. Towing I usually get 14-15. I drive right at the speed limit and run my smarty jr on #2 with an intake and exhaust.
Fordman00, I've had 6 or 7 Powerstrokes. My last one was a 2000 CCSB and the best it would get was 14 and 9-10 towing. They were good trucks but I couldn't get the milage up.
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