The fastest speed in a water jet powered car is 26.8 km/h (16.65 mi/h) and was achieved by Jason Bradbury (UK) on the set of The Gadget Show at Wattisham Airfield, Ipswich, UK, on 15 March 2010.
The speed is the average speed of two runs in opposite directions. The speed was measured each time by independent professionals with a radar gun. The car had a pressurized tank containing 70 litres (15.4 gal) of water and 90 litres (19.8 gal) of air plus two auxillary tanks on each side of 7 litres (1.54 gal) each. The tank system was pressured at 8.2737 bar (120 psi). The vehicle had no other means of propulsion.
Comments below may relate to previous holders of this record.