around 1350-1400 rpms @ 65. The calculator mentioned above is way off. This would be closer but is not correct either, I supposedly turn 1460 according to this. It's around 1100-1200 @ 55, and engine load is way down.

 

P235-70R17, 3.55LS, 1850RPMs.

 

295/45/18......4.10 gears..... 65mph= 2200 RPM

295/45/18......4.10 gears..... 80mph= 2700 RPM

 

Josiah, what gears are you running? I turn about 2,000 rpm with 4.56's on 35's at 65mph. I see you run 37's but still how the heck are you turning 1,400 rpm's at 65 mph?

 

a larger tire, and lower gears, those both go in favor of highway RPM's. My rpms are always lower than yours, hence the reason I bog down in town, you can hear the characteristics from bogging in my exhaust note. You have both smaller tires (35's), and higher gears (4.56's). You gained in town power/mileage, lost highway, in respect to gears. If I threw 4.88's my rpms would be around 2000 according to the calculator.

I run 3.73's.

 

Gotcha, I was thinking you were running 4.88's or something like that when I saw the 37's.