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When I had my Duramax, already broke in, bought used with 30k miles on her. I've always varied my speeds on new engines, tried to keep it under 65 mph or so. I'm sure there are lots of others with their methods. Fuel, always used a top tier brand and tried to fuel up at stations that had a high traffic of vehicles filling up. This was told to me mainly that the fuel should be fairly fresh, lack of moisture; moisture in fuel not good.
I wouldn't "baby it" so much, but not "shower down" on it either for about 1k miles. IMO
 
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