I have a 35 minute commute each way. I would say that is about the minimum for the car to come up to temp and run efficiently enough to justify the diesel premium in purchase cost and fuel. I like to get it out on the road for 1-2+ hours twice a month at least. Racing takes care of that during the season. In the offseason I will take he long way to destinations and do drives I could avoid. I'm taking my kid back to college on Sunday, that's an 8 hour round trip. The car will run noticeably better after a run like that.
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