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i suppose mine does cut off the fuel supply when using the engine brake. i never coast down on strong hills where the truck would start accelerating. there i must use the engine brake anyway, otherwise i would be driving all the way down with my foot on the brakes.
but i do coast down in every other situation because the engine brake is quite strong on a diesel truck so if i release the accelerator it brakes way to fast on hills that have anything less than 5% downward slope
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