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You can test that by filling some petrol(about 50 ml) and running the engine on neutral till the petrol burns up completely.

do it the way showroom people calculate avg of bikes.
1.Turn petrol knob off.
2.Take 50/100 ml of petrol in a small bottle (with a pipe at the bottom)
3.remove pipe from knob to carb from carb side, connect bottle pipe to carb
4.start engine + start clock and keep it idling ONLY till petrol in the bottle finishes, NOT till engine stutters to death(i.e. it uses up petrol inside the carb too).
5.Note timing and post in this thread.

Easy way: Turn off engine whenever you have to idle for more than 15 seconds. You will end up saving a bit of petrol for the nation in the long run. LONG LIVE ENGINE KILL SWITCH

P.S.: I personally dont feel there is wastage of 10sec idling worth of petrol in starting a bike(as is the common consensus) as the energy required for starting the bike is provided by the rider(kick start) or battery(starter) and not by the petrol inside the chamber, so in my opinon, if we start in gear, and ride off immediately, no petrol is wasted.

BTW I had a query.. If we (in a hypothetical situation) happen to kill the engine in high gear with the bike still in motion(using engine braking to slow down, no clutch), does petrol continue to enter combustion chamber or does it stop as soon as we kill the engine.

Depends on if you're riding a carbed bike or an FI bike. In the case of the carb, as long as there's air being sucked through the carb, there's petrol going into the cylinder. The only way to make sure there's no more fuel coming from a carb is to turn off the fuel stop and run until the carbs float chamber is empty.

For FI, no power to the injector, no fuel in the manifold.

+1 to that. Whether the engine is killed or only the throttle is closed during coasting, the amount of fuel comsumed is same (at minimum throttle position) for older bikes and cars. But- I have seen in some modern scooters a fuel cut-off solenoid on the carburettor. Here switching off the Ignition may make a slight difference.
Even in Maruthi-800 (old) Carburettor there is a Solenoid to cut-off the fuel to the Idling circuit.

^
Slight correction:
Unless you wind the throttle, no fuel gets sucked in, because the needle closes the fuel valve. So even in there is petrol in the float bowl, and throttle is closed, no fuel enters the manifold.
(I think it works this way, correct if I'm wrong)

For Fi you're spot on.

Still little amount of fuel will be sucked in when throttle is closed for keeping the engine idling.

My Maruthi-800 is not FI its Carburettor.

I have a query. Does a bike consume more petrol if I depress the clutch while the engine is running?

Actually inside a carb, there are various circuits for air-fuel mixture to flow. Even when the throttle is closed, the idle circuit will still supply fuel to the engine. And, when the throttle is closed suddenly at high rpm, extra vacuum is created. This results in extra fuel flow thru the idle circuit.

No. It should be the same.

No. It should be the same.[/QUOTE]

The engine will be idling and consuming the minimum fuel if the throttle is closed at the same time.

The engine will be idling and consuming the minimum fuel if the throttle is closed at the same time.[/QUOTE]

Thanks a lot guys!

When the Engine is in Idling there is minimal fuel supplied, I guess it makes no difference if the Clutch is engaged, It will still supply the same amount of fuel.