9. FUEL: Only petroleum-based unleaded or leaded gasoline as defined by the American Society of Testing and Materials (ASTM) is permitted. Briggs & Stratton recommends the use of 92 octane unleaded gasoline in all Vanguard engines. Higher octane fuels can cause higher operating temperatures and reduce the running life of your engine. The only oxygenates permitted are MTBE and ethanol alcohol in the same levels as that are found in pump gasoline. INEX reserves the right to require all cars use the same brand and designated grades of gasoline in a given event.
Specific Gravity - The specific gravity must fall between .710 to .770 at 60 degrees Fahrenheit.
BANDOLEROS
Laboratory Testing - INEX has the ability to conduct laboratory analysis of fuels. Samples for lab analysis may be taken from a competitor’s fuel tank at any time at the discretion of INEX.
The specific elements which will be searched for include: propylene oxide, alcohols (all types), aldehydes, aminodiphenyl, benzene (in excess of EPA limit), benzidine, beryllium compounds, bromine compounds, butadienes, chlorinated compounds, chromates, dioxanes, ethyl acrylate, ethylene oxide, hydrazine compounds, methylene dianailine, naphthylamine, nitrogen compounds (nitromethane, et al.), styrenes, toluidine and xylidine. Also added to this list will be substances deemed to exceed the Threshold Limit Values (TLV) or Biological Exposure Indicies (BEI) as listed by the American Conference of Governmental Industrial Hygienists (ACGIH).
Penalty for Fuel Rule Violations - Any competitor (driver and/or owner) caught using any of the illegal fuel additives as previously mentioned is subject to a minimum 60 day suspension from the date the driver is notified of the test results. Suspensions will be determined by INEX based on the chemical composition of the additive in question.
10. “LEGAL” FUEL ADDITIVES: Lubrication or knock suppression additives are permitted, provided the resulting mixture meets the specific gravity and lab analysis requirements.