According to Official Guinness Records,
The longest reverse ramp jump in a car is 27.2 m (89 ft 3.25 in) and was achieved by Rob Dyrdek (USA) for MTV's "Rob Dyrdek’s Fantasy Factory" at Six Flags Magic Mountain in Valencia, California, USA, on February 13, 2014.
The attempt was part of the series finale of the show.
For a complete list of 2014 records, please visit 2014 Guinness Records in United States.