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Re: What grade gas do you run?
Well, my opinion is, 87 suppose to get you more mPG than higher octane, so i dont know how he's getting more mpg on 91 than the 87. Higher octane has lot more cleaning agent and octane and less actual fuel. But greater combustion... so some newer cars need the higher octane for greater combustion otherwise the check engine light will come on and knocking and pinging occurs. I'm not sure if the FJ needs that higher combustion.
So i've heard...
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