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2015 cascada 245 wheel base dd15 13 speed

Whats the best mph or rpm to run ? The sweet spot 1375-1450 rpm ? Help ?? 342 rear end gears / dd15 / 13 speed / fleet air filter / pull a van wt 75-80 thousand pounds./ 10-30 fully synthetic Mobil oil / i get 5.22 mpg driving 70 mph / drove 65 mph didn't see much different s in mpg ! have 22.5 Tall tires on . i have 218000 miles on engine. I did the overhead on dd15 at 100,000. I am looking for ideas to get mpg up !

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Is it worth changing gears ? On midroof semi fighting the air flow also ?

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Look for the facebook groups mpg masters and 9 MPG club. Lots of great helpful people there, running well monitored, great pages. That speed and specs should be getting 5.7-6.0. America Moves By Truck to check tire rolling resistance. If slowing down didn't increase mpg, you may have a leaking charge air cooler, and you need the overhead ran anyway. Look for a roof fairing, and get very low rolling resistance low-pro 22.5 tires will be a great start. Turn off the cruise control. 7.5-8.0 should be possible.

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bret will be eternally grateful.
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