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DeepVee · 11-04-2016, 03:59 PM

Yeah, we run in the mountains all the time, almost every where we go is up and down. The 75-80 MPH toy hauler boys fly by us on the flats then we kill them in the hills.

We went to Tulsa, Knoxville then back to AZ over the summer. Driving out on the plains was interesting and kicked our overall average fuel economy up a little. Even with a 66-MPH cruise though we were constantly passing semi's in the small hills out East.

We do get knocked down on the really big climbs here in the West but we never go below 7-Low (9th) on the interstate. I try to pull up at 1,700 RPM with the Detroit and will let it go to 1,500 before I grab another gear. Detriot says we really start making power from 1,800 to 2,200 but I don't want to go there.

What kind of RPM's do the auto's pull up at? I'm not sure if the Cat's & Cummin's have similar torque curves.

11-04-2016, 03:59 PM	#53
DeepVee Member Join Date: May 2015 Location: Flagstaff Posts: 49	Yeah, we run in the mountains all the time, almost every where we go is up and down. The 75-80 MPH toy hauler boys fly by us on the flats then we kill them in the hills. We went to Tulsa, Knoxville then back to AZ over the summer. Driving out on the plains was interesting and kicked our overall average fuel economy up a little. Even with a 66-MPH cruise though we were constantly passing semi's in the small hills out East. We do get knocked down on the really big climbs here in the West but we never go below 7-Low (9th) on the interstate. I try to pull up at 1,700 RPM with the Detroit and will let it go to 1,500 before I grab another gear. Detriot says we really start making power from 1,800 to 2,200 but I don't want to go there. What kind of RPM's do the auto's pull up at? I'm not sure if the Cat's & Cummin's have similar torque curves.