Quote:
Originally Posted by Joe1234
Why would you coast with the clutch engaged? Makes more sense to disengage the clutch so the engine can drop to idle RPMs.
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When coasting with the clutch engaged the car's momentum is pushing the motor to continue turning. The Civic computer senses this and cuts all fuel to the injectors, creating a "dead" engine until you touch the gas or put the clutch in, idle rpm or not (called deceleration fuel cut-off, or DFCO). Not all stick shift cars cut the fuel on decel, but Civics do. If you were to put the car in neutral or push the clutch in the computer would continue to pump fuel to keep the engine at idle. DFCO can really bump up your mpgs going down a long hill or where you can decel slowly without ticking off other drivers.