Effectively all the fuel that it burns while idling. You are getting 0 miles per gallon while idling.
There can be many reasons why a car surges while idling. Some of these reasons are the computer could be dying, or the fuel injector are giving the engine too much gas.
that depends on size of engine
Fire does not burn, its whatever if fueling the fire that burns. For example, wood is a fuel that burns, and fire is the result. The speed at which a fuel burns, depends on the fuel. i.e. Wood burns much slower than gasoline.
4.7 liter per/hour
A Honda Ridgeline typically consumes about 0.2 to 0.5 gallons of fuel per hour while idling, depending on various factors such as engine condition and accessories in use. This can vary slightly based on the model year and specific engine configuration. Idling for extended periods can lead to unnecessary fuel consumption, so it's generally advisable to turn off the engine when parked for long durations.
A 1990 Suzuki Samurai may flood while idling due to several reasons, including a faulty carburetor that allows too much fuel to enter the engine, a malfunctioning choke that remains closed, or issues with the fuel delivery system such as a stuck float. Additionally, worn spark plugs or ignition problems can prevent proper combustion, leading to an overly rich fuel mixture. Ensuring proper tuning and maintenance can help resolve these flooding issues.
Too high of an idle could be producing too much fuel for your jets to work with
it idles quickly to save as much fuel, energy, oil, etc. as possible
this depends on the rate at which your car burns fuel
too much fuel (unburned) getting into the exhaust. could be your oxygen sensor or catalyst converter. less likely, a leaking fuel injector
This will depend on how hard you are using it. If the machine is idling, it is not going to use as much as when you are using it full steam.