When you get a chance can you give us your 80 MPH cruise RPM and tire size and MPH?

 

Will do first chance I get.

 

Took the truck out this mourning. At 80 mph, I was turning 2450 rpm. This is with the stock 275/55-20 stock wheels and tires. The DIC shown I was getting 13-15 mpg at 80 mph. The ECM had been adjusted for the new gears prior to the install so the mph was dead on, according to my GPS unit.

 

Thanks,

I was wondering about it. My 05 didn't have a 3.73 option that year and I had to go with 3.42 out of fear of the 4.10 option.
She will be paid off this November and will get new gears when the money piles up.
I do 2000 rpm @ 80 mph with 265/70/17's so I need to decide between the 4.10 or 3.73's now.