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I have read high and low about what gas to use in the 250 and the average is 87 octane. I hear running a higher octane makes the motor run to rich. In reality higher octane gas burns at a higher temp which could change certain characteristics of the motor. In my car however I run Prem. octane in it, and car motors are usually more refined and controlled, I notice it idle smoother and has quicker pick up.
GTsmokeya
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