To Turn Up Or Not To Turn Up??!!

My scan gauge has shown 490 off cruise.

 

That is shameful, only 5,5...Horrible....mine with an s60 Detroit gets 7+ loaded, 9+ empty. The cat hates to go above 1400 rpms, so 72 is killing you. If you want to go 72 a lot, change your dif so you can go 75 at under 1400 rpm.

 

When it has a heavy load like more than 35k lbs looks like the the multi torque kicks in and does fair mileage. I usually drive 60-63mpg and it seems that the diff ratio vs horsepower don't match. My buddy drive a fl Columbia with a s60 but he does 63mph @1450rpm and with a 53' reefer with 40k + lbs loads and does 7mpg.

 

Hey where can I find that guy? I'm new here so help me out.

 

I might need a higher diff ratio at least between 3.55-3.70 so the engine don't has to push to hard to move the diffs and tires.

 

Give info on that Mr Haney. Im from Florida.