I calculated my fuel over. 1200 miles the last three days and had 7.834 mpg. Half of that was towing a light trailer and the return trip I had 3k lbs on truck and seven on the trailer. Mostly hiway 65 mph.
Is there anyway to set the RPMs at 65-70mph to
Go to 1200-1500 rpm for better MPG?
Can a custom tune do this?
Changing the final gear ratio in differentials is about the only way to change that rpm at 65 mph. Tire changed to a larger diameter effectively does the same thing but at a weight, rolling resistance and an air resistance penalty. There is no magic wand waving (tuners) for good gas mileage on a V10