What rpm at 65mph ???

@The Wiz

 

Is that in top gear?

 

Our trucks our governed at 65, they turned the RPMs down to where it runs 65 at 11-1200 RPMs max. It didn't effect the power in my mind, but Volvos actually pull very well even when governed. I am getting 7.7 miles per gallon as of today, my load is 39000 roughly in a slightly heavier reefer trailer. If you run 65 mph at 1400 RPMs, the sweet spot on that particular truck has to be somewhere around 60-63 mph if you're trying to get good fuel mileage. More RPMs means more power, more fuel consumption, especially under heavy loads.

 

My opinion is the 3.70s are a great all around gear esp if running a lot of hill country.

Looking at that chart if you stay 63-65 you're looking at good overall mpg and better start-ability than the taller rears

 

Yes, was in 18th on flat terrain... with 41k in the reefer.

 

I have Low Pro tires..just assumed most trucks have them now.