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

Headwind and tailwind would explain this, also if one run was flat and the other had a slight uphill.

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