Fuel Saving Tips

To coast in neutral or not?

It has been suggested by some that the engine computer shuts off fuel to the injectors when under negative load (ie coasting to a stoplight). Using a Scangauge to read the instantaneous fuel consumption in 3 fairly modern vehicles and all of them did not turn off fuel and all used more fuel coasting in gear as opposed to neutral. Most engine management systems use the O2 sensor in the exhaust as the dominant factor in determining how much fuel to put into the engine. Probably the only vehicles that would not benefit from coasting in neutral are hybrids and/or vehicles with exotic engine management systems that automatically stop/start the engine.