The ecu is smart enough to realize it's engine braking and it shuts off the fuel injectors. Various makes and models have different conditions required. Hondas are usually >1000 (or 1100) rpm. Some have speed requirements, or wait a second or two first, like t_vago's dakota. The wheels are driving the engine in this case.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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