in the TV, it will display how long do the driver spend in the pit stop to count how many laps he can run.

that means there are a standed fuel consumption estimation by FIA. Can we know the estimation fuel consumption of all track or not?

Quote from scania :

Can we know the estimation fuel consumption of all track or not?

Quote :

The length of an F1 pit stop is controlled by the amount of fuel added. The rules limit the pressurized fuel flow delivery to about 12 liters (3 gallons) per second. Thus it is possible for rival teams and fans to estimate what a team’s strategy is by monitoring how long the fuel hose is connected to the car.

Source: http://www.indianapolismotorsp ... Of_A_Formula_One_Pit_Stop

Use that and the track length to get a fuel consumption estimate

how to calculate?

You still need to know the fuel consumption, otherwise you cannot make an estimate. This is what scania is asking for.

Wikipedia says:

Quote :

Race fuel consumption rate is normally around 75 liters per 100 kilometers traveled (3.1 US mpg - 3.8 UK mpg - 1.3 km/l).

Of course every track has slightly different consumption rates, but you'd have to have exact measurements on how much fuel was added for a certain driver, how much he started with and how much was left after a race to get a meaningful value for a track (and car).