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A block heater will also make a big difference in your engines operating temp on that long downhill ride. If you can get the engine to operating temp the mileage should climb dramatically, especially if you can not get it up to operating temp otherwise.
Even idling the fuel consumption would reduced by probably close to 70%.
DFCO will probably kick in much sooner.
This is based on the assumption that you are not able to get the engine up to operating temp before you get to the bottom of that considerable grade.
regards
Mech
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