Quote:
Originally Posted by Ecky
Warmed up and idling at 850rpm my 1.8L gasser (B18B1 from a 90's Integra LS/DA) uses about 0.36GPH, but when the car is rolling my idle roams between 850 and ~1400rpm, so I end up with an average rolling idle consumption somewhere around 0.45, give or take a few hundredths.
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Idle RPM with an ECM/PCM is not constant like on older engines. When parked yes it will be near constant. Things like airflow and coolant temps (which vary at speed) are built into your tune, time and % from letting off throttle spark/fuel changes, and of course startup vs @ operating temp, all allow for an adaptive idle, auto transmission idling circuits are more involved than this.