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Kenn · 04-02-2014, 02:11 AM

The engine is manual, it is a 1987 450 hp Cummins STC (step timming control). We were pulling my sisters Jeep Liberty and driving at 60 mph. I have a 13 speed and in 8 th direct 1500 rpm = 60 mph. I could climb 6% grades at that speed until truck traffic became an issue. My old Itaska with a 454 chevy would get 7 mpg at 55 mph and drop to 5.5 at 65 mph. I was very happy with the mileage and being able to clime step grades is a big plus.

04-02-2014, 02:11 AM	#353
Kenn Senior Member Join Date: Sep 2010 Location: Willamina Or Posts: 277	engine info The engine is manual, it is a 1987 450 hp Cummins STC (step timming control). We were pulling my sisters Jeep Liberty and driving at 60 mph. I have a 13 speed and in 8 th direct 1500 rpm = 60 mph. I could climb 6% grades at that speed until truck traffic became an issue. My old Itaska with a 454 chevy would get 7 mpg at 55 mph and drop to 5.5 at 65 mph. I was very happy with the mileage and being able to clime step grades is a big plus.