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I've not done any real scientific testing or anything, but I usually try to leave the heater on for at least 2-3 hours or esle I don't think its worth your time to plug it in. Anything shorter than that I just don't notice enough of a change in the cranking abilities of the engine to warrant...

Absolutely agree. I'm in your shoes 2mtrucks. My ether start system works great, and there will certainly be situations where I'll be forced to use it. But given the choice I'd much rather start my engine pre-heated by the block heater