Quote:
quote:Originally posted by Snownyet
Quote:
quote:Originally posted by KathyandDave
You said: I also run 62-63 mph @ 19.5K RPM, always Tow Haul with the Monty.
Did you mean 1.95K RPM? Why always Tow/Haul? It increases the RPM, which suggests that fuel consumption is increased. In our admittedly brief experience, on flat terrain, the ordinary gearing pulls well at lower RPMs. We're using the T/H only for grades and leaving it on for hilly terrain. Are we missing something?
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Tow haul increases the rpms that the transmission shifts at as you accelerate. When crusing down the road at 60 my rpms are the same in both tow haul and regular mode. Plus using tow haul activates the grade braking feature on newer trucks.
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GM says to use the T/H if your GCW is 75% or more than the GCWR.