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I don't know if it's effective, but this is my warm up ritual:
I live on a long one way street, and it's about 3/4 of a mile to the stop sign. Cars are parked on both sides and it's narrow so about the fastest you can go safely is 20 mph. When I leave for work in the morning, I short shift into second at about 15 mph and then get to 20mph and set the cruise in second gear until the end. My thinking is that the car builds heat better than it would in 3rd.
At the end of the day it doesn't matter I am sure, but even with 121k miles it still only uses about a qt of oil every 5-6k miles.
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