It is likely to be a function of the vehicle warm-up state, somewhat specific to the make and model. In our 2003 Prius: - coolant below 70C - engine will run unless in "R"
- unloaded "N" idle - runs about 0.30 gallons/hr
- loaded "D" idle - runs about 0.60 gallons/hr
- sometimes when stopped - "R" and pulse engine turns engine off
- coolant 70C and above - engine can "auto off" following the multi-stage warm-up
Regardless of which car, the ScanGauge or an OBD scanner that shows mass air flow is needed to track the fuel burn. Then experiment and find out what works.
Bob Wilson
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2019 Tesla Model 3 Std. Range Plus - 215 mi EV
2017 BMW i3-REx - 106 mi EV, 88 mi mid-grade
Retired engineer, Huntsville, AL
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