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Coasting is when you take your foot off the gas pedal and begin to gradually slow down as you drive. As long as the clutch is still engaged, the connection between your engine to your wheels is still maintained. During this time your engine goes into a fuel cut-off mode where it essentially operates in reverse, with the power coming from the wheels to the engine. This allows all your car?s accessories (like you?re A/C, alternator, coolant pump, etc.) to continue to run without using any fuel!