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Message: <blockquote data-quote="manjohari" data-source="post: 537491" data-attributes="member: 23955">I'd say both Shell 95 and Petronas 95 have the similar combustion power and pre-ignition (knocking) characteristics. (the addictive they put is well kept secret, maybe they add some isobutane to increase combustion? with the combination of addictives, they will make your car has more acceleration power with less milage or more milage with less acceleration power (esso/mobil) )Depends on your driving style, if ur rpm is high, there should be noticeable performance in term of acceleration for higher RON rating, since higher ron provide more combustion to the engine. some people use Octane Booster which translate into having higher RON in your fuel tank. But, sulfur content for our petrol is much higher than country that mandates Euro4, but significantly lower than sulfur in any diesel of course.I do believe if we have Diesel Euro4 in near future, the price is much higher than current Euro2, there's no performance difference but more towards sulfur content. Our beloved country sell our "premium crude oil" which has low sulfur and buy back less expensive crude oil from middle east and do refinery at PD for example.</blockquote>