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Carburetors usually don't do fuel cut. In that case, Neutral is the best option, period.
On cars with fuel cut programmed in, it's the wheels driving the engine. Just like the engine driving the wheels in normal operation. There's a direct (through gears and all) connection between the pistons and the wheels. When you let off the throttle, the car's momentum will keep the wheels turning. That, in turn, drives the engine. It'll keep turning whether or not there's any fuel burning, so why use any? The control unit turns off the injectors.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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