I too worried about cold-start issues when I bought my duramax. Last year when I was home to Iowa, though, I started it on a 0 degree F morning with only maybe 1-2 seconds extra cranking from normal. I thought it was plugged in, but after I unplugged it I found out Dad had cut the juice to the outside plug-ins to work on one and never turned it back on. I think modern diesels with all the extra intake air heating, longer glow plug cycles, fuel heaters, etc. are no longer much of a problem in cold weather-just have a good battery.

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Keep everything as simple as possible-but no simpler--Albert Einstein