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I have no experience with diesels or turbos, but I approach cold starts just like warm starts. Low rpm, high load (say medium load for the first minute), EOC. I'll let it idle a few seconds after starting, but that's it. Any deviation from that for faster warmup is extra fuel used.* My car has lived 200,000 miles, so I doubt extra wear is a significant factor.
Faster warmup does mean lower fuel usage later in the trip, but at best you get back half of what you spent warming up. Best fuel consumption is to arrive at the other end with the coldest engine you can. Grille block to make it warm up faster.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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