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It would allow the diesel to run at a constant speed, except when going down hill, where it would idle.
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The VW TDI turbo diesels cut injection quantities to next to nothing when in gear going down hill - (with your foot off the accelerator). Even more efficient than coasting out of gear with the engine idling.
It seems that there should be some way to use this same technique in your truck when there is no demand on the engine.