Race fuels (e.g., VP Racing Fuels, Sunoco Optima) contain proprietary additive packages. If a fuel analysis system (e.g., in a Formula 1 or IndyCar telemetry rig) tries to classify an unknown blend, it might label it as:
Note that "Undefined Fuel" or "Fuel Other" codes (like 076–098 or 099) may not automatically trigger tax-exempt processing in certain fleet programs. undefined fuel-reserved for proprietary
The computer is detecting pressure that is too high or too low. Race fuels (e