I understand that this varies for different car but lets take a situation of a 2.0L engine with 600rpm when sat on idle.
.5 GPH for most V8s
.33 GPH for most V6s
.25 GPH for most 4 cyls.
These are average numbers but can vary considerable depending on engine displacement and idle speed. Adding loads like AC can increase it substantially.
Agree with Dreher,
My experience with a 4 cylinder, 1.5 Liter, Gasoline engine has been that, after cold start the consumtption is around 1.2 L/Hr. Once the engine is warmed up, it went to a level of 0.5 L/Hr max.
It actually, depends on engine fuelling requirements, and hence the calibrations. can even vary for same engine under different operating conditions -
1. Engine Temperature,
2. Electrical Load - If alternator is demanding more torque, the idle RPM will be slightly increased and hence higher FC.
3. Accessory Operation - typically high consumption loads like AC, Headlamps, etc trigger an increased idle rpm. Electric Power Steering can also influence.
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