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I get better fuel economy towing 68-70 mph than I do at 55-60 mph towing my assortment of trailers. I put the truck in drive, turn on the exhaust brake and tow/haul mode and let the computer do the rest for me. Empty turning 2000 RPM's equals 82 MPH. My new 2012 Ram DRW seems to be happiest at 1850 rpms or 79 mph.
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