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Maybe it's just the darned 10W-30 crap dino oil in my engine, but I seem to notice that the engine behaves a little differently after say a 20 minute drive vs. a 10 minute drive that just barely gets the coolant temperature up. (idle goes down to 680, usually it's more like 800-900, no idea why) Going by that I'd say 80% of my trips are short trips.
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