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Automotive glossary: What is Gasoline or Petrol?

Definition of Gasoline: Gasoline is made of crude oil, but can also, by more expensive procedures, be extracted from carbon. The most important predicate of gasoline is its "octane number" (ROZ), it lies in between about 90 and 100 and indicates in what extend the gasoline-air-mixture can be compressed, without firing itself by the hereby evoked heat build-up and the pressure increase and heat build-up by already ignited fuel gas portions. So premium gasoline with ROZ 95 can be compressed more heavily, with exploding, than regular gas with 91 ROZ. A higher compression is desirable as it allows a higher energy yield. So engines that work with such a higher compression also need the complying premium gas, as by operating it with regular, the mixture explodes too early, strikes on the piston (the engine "knocks"), and so sooner or later cause mechanic damages. Though, modern engines dispose of a "knock sensor", that then causes the engine control to shift the ignition timing backwards, so that the harmful knocking is avoided. Still, it is not advisable to refuel gasoline with insufficient octane numbers, as at least an increased fuel consumption results. Regular gas engines though can refuel premium gas without any problems, but that has no effect besides the higher price.

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