How much fuel does an aircraft burn on taxi?

According to some British research, larger airports with a long taxiways like London Heathrow and San-Francisco, can use up to 3% of the total fuel load.

For a short-haul round trip, using 5,000kg of fuel, 3% would equate to 150kg or 47 US Gallons of Jet-A. (About $100 worth of fuel).