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Great thread. I'm like you in that I drive a larger truck for work but still strive for better economy.
A guy on a Powerstroke forum got up to 23mpgs when most folks were happy if they got even close to 20. How? Biggest impact was going to an add-on Gearvendors overdrive unit on top of a rear diff ratio change. The goal: lower rpm.
I find 2,000rpm is the sweet spot for efficiency. Climb above and kiss the economy good bye. I now have a 6.6 LMM Duramax and it cruises at low rpm. That brings up another question: cruise at max torque or minimum rpms?
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