Different RPM’s @ 80 MPH?

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I have a manual transmission and was under the impression that a certain RPM on a particular gear will always generate the same MPH. The other day I noticed I sit at 2,800 RPM in 6th gear @ 80 MPH, and other times it’ll be at 3,200 RPM – Could some explain?

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15 Answers

Anonymous 0 Comments

If you’re in the same gear the speed of the engine will *always* be directly linked to the speed of the car – so either you weren’t in 6th both times, or your speedo is wildly inaccurate, or your clutch is slipping (or you’re riding it).

A 400rpm difference suggests you weren’t in 6th both times.

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