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Controlled substance

Can you advise me whether cruise control on a long motorway journey is more fuel-efficient than the right foot? I thought that as the fuel is being constantly monitored to maintain speed, then the computer would be more sensitive than the driver.

Asked on 19 December 2009 by

Answered by Honest John
In a large-engined, powerful car, maybe. But in a smaller car that requires increased revs to maintain speed up inclines, then the cruise control will use more fuel than a driver with a sensitive right foot who allows the car to slow up inclines and increase speed down them.
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