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Time for the genuine MOPAR winter front.
And of course you can hit mid-20's, that ain't no Ferd.
For what it's worth, I set the cruise control for 1,725-50 rpm. That's the "fastest" slow speed I can run at what is economical. CUMMINS sez the 6.7L is best at 1,300-1,600. 3.42 gears are tempting me once I have trailer spec and other weights (wanting to reserve power, not ultimate mpg as with, say, a 3.21 set) as I'm thinking my rig will always be 18k or lower. Altitude is the potential future problem (but maybe a set of twins, a new cam and EFI Live can come to the rescue).
Look forward to what you find with gauge readings as you go along.
Have you laid out truck spec elsewhere? Tires, gears, weight, etc?
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