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the only change I have seen in my 04 is a loss of gas milage. I have gone down from 18mpg to 15mpg. So it is now worth the 20 cents more...almost. Also with lower oct gas you run the risk or knocking or build up because it will not burn as hot as the higher octain. I do not suggest you put in an octain booster that can hurt your injectors.

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Q: What if you use 87 octane gasoline instead of using 91?
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