The today situation with the FIA records.
In the 60's when the jet cars pushed the records to a new limit, the FIA has to change the categories in the record list.
The first jet record was certified by the FIM - this was the 1963 Craig Breedlove Three Wheeler Spirit of America - the first official from the FIA recognized jet engine record was the late Tom Green 1964 record with the Walt Arfons Wingfoot Express.
Today there are two groups of record list.
The unlimited class - categorie C - means thrust powered vehicle - split in Jet engine and Rocket engine.
The faster of the two record are the absolute World Land Speed Record - this is today Andy Green with the Thrust SSC from the 15 October 1997.
But the Gary Gabelich record with the Blue Flame rocket car still counts as the fastest - in the his categorie.
By the way, there is no different between single and twin jet engine - some people mention that Richard Noble's Thrust II record is still the single record holder, but this is wrong.
The wheel driven records are called International Land Speed Records.
The wheel driven record is split in two base catogeries - blown and unblown.
There is NO different between gas and fuel so as the national records from the Speedweek, World of Speed and World Final - this is only a USFRA/BNI/SCTA specification.
For the blown records there is also no different between turbo and supercharger, all runs under blown.
The blown and unblown piston engine catogeries are split in 11 different engine size categories, the size is a little bit different than the national records, as a example - national is 61 cubic inch (1 litre), the FIA is 66 cubic inch (1.1 litre).
This for the piston engine.
Turbine (Don Vesco), Electric (White Lightning) and Diesel are running in three different weight categories.
For all categories - unlimit and wheeldriven - is one rule the same - all four (or more wheels - Spirit of America Sonic Arrow got five) wheels had to be on the ground
If this not push start - as Malcolm wrote - is really on the rule book, than it was never used in the last year - all the records was official recognized.