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Enhanced octane is one route to fuels differentiation where associated vehicle performance benefits are generally measured under controlled wide-open throttle tests on a chassis dynamometer. The combined availabilities of relevant ECU data via OBD and telematic loggers present new opportunities to assess such fuel benefits on the road in normal real-world driving environments. A novel methodology is described in this paper which utilised the remote logging of key engine EOBD data from a fleet trial and the results successfully demonstrated significant octane-derived benefits in many vehicles throughout normal mixed-roads driving. The availability and the reliability of telematic loggers mean that the method could be implemented in a scalable way as a complementary approach in addition to conventional laboratory vehicle testing.