Quote:
Originally Posted by PugMom
my large town car livery requires premium gasoline, & performs much better when using it. a car 'expert' once told me it uses less rpm, which is easier on the engine. not sue if this is true or not, but i do notice poor performance when using regular gasoline. the cost isnt an issue as much, i make up for it in other areas where i do not spend regularly
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The octane rating of gasoline has absolutely nothing to do with RPM. Transmission and differential gearing determine the final drive ratio which is what determines engine RPM when driving. The reason you "notice poor performance" when using regular gasoline is because the ECU retards timing to prevent pre-ignition (knocking) which results in less efficient engine operation.