1: you don't necessarily need to stay under 3k past the first few minutes of driving. I wouldn't wail on it, but trying to stay under 3k is a bit ambitious. You might look into a partial block off plate to run at times when it is cooler out, to help things warm up more quickly. If it is taking 25 minutes to warm up in the 70s, you'd definitely need one when it gets colder.
2: what would you like to accomplish here?
3: the tune is stored in PROM, so it will remain through a power reset.
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