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RPM vs. Speed


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At 2000 RPM in Drive, the speedometer has always registered 72-73 MPH. One day last week, I had been driving about 30 min and noticed that the rpm was about 1900 but the speedometer was only showing about 60 mph. I thought maybe I was in 3, but not the case. Later, it went back to 2000 and 72/73, and then again later it was back at 2000 and 62 mph. Hasn't done it since. Outside temp was 19deg but I had been driving for some time. Just puzzled me.

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