through a contract with RML Group. This has allowed many independent teams to enter without the need for manufacturer support, and negating the need to source ex-works cars. Teams can install an engine from their marque's broad 'family' of cars, or opt to lease an engine from TOCA, built by Swindon Engines which also helps to make the cost of entry more affordable. To further keep costs in check, the BTCC uses a single tyre supplier, with Dunlop the current supplier of rubber to all the teams. For dry races, the Dunlop SportMaxx Prime tyre is used, along with the use of the Option tyre (Soft/Hard) mandated at one race each meeting. For wet races, the Dunlop SportMaxx BluResponse tyre is used. Fuels The rules previously allowed for a variety of different fuels in a bid to encourage more efficient cars. In 2004 Mardi Gras Motorsport independently entered a Liquified petroleum gas powered Super 2000 Honda Civic Type-R (which was subsequently replaced by a more competitive BTC-Touring Peugeot 406 Coupé, still LPG powered), and in 2005 Tech-Speed Motorsport converted an ex-works Vauxhall Astra Coupé to run on bio-ethanol fuel. In the middle of 2006, Kartworld's owner-driver Jason Hughes converted his 4-cylinder MG ZS to run on Bio-Ethanol, soon followed by the West Surrey Racing cars of championship contender Colin Turkington and Rob Collard, and for the final event at Silverstone, Richard Marsh converted his Peugeot 307 to run on bio-ethanol fuel. Only Hughes continued on this fuel in 2007 and 2008. The regulations also permitted cars to run on diesel; attempted first in the 2007 season by Rick Kerry in a BMW 120d E87 run by Team AFM Racing. In 2008 SEAT Sport UK entered two Turbo Diesel Power SEAT Leons – the first diesel powered manufacturer entered cars. At the start of the 2010 season, it was announced that Team AON racing had converted both of their Ford Focus ST cars to run on LPG. Under current NGTC regulations, all entrants use Carless HiperFlo 300 which is a 101/102 RON and 89/90 MON unleaded gasoline with approximately 2% oxygen content that meets the FIA 'Appendix J' gasoline specification. Previous regulations The following regulations have been applied to the championship: 1958 – unique BTCC regulations 1959 – FIA Appendix J Category C 1960 – 'silhouette' special saloon cars (1000cc) 1961 to 1965 – FIA Group 2 1966 to 1969 –