1998 Detroit Series 60 with an Eaton 13-speed in a 41' twin screw rig pulling a 10K lb enclosed trailer. My average bounces between 7.63 & 7.65 MPG according to the Detroit computer and depending on the hills. We pull at 66 MPH at around 1450 RPM's. I'd love to have a taller gear but just not sure it's worth the effort & cost to change them.
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