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The answer depends on the gear ratio of the vehicle in question.
One vehicle may get better gas mileage in 3rd gear, while another may do better in 4th.
Generally speaking a lower RPM measurement while driving will yield greater efficiency, and will therefore be more economical.
This means that it would be typical to get better gas mileage in 4th gear because the engine would have to be operating at a higher RPM to do the same thing in 3rd gear.

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15y ago

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