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i ran exxon, 93 and then a bottle of prestone octane boostered, it says it rasies the octane 10 points, well maybe it did, but it killed my first o2 and cat. not doing that again.
I have never noticed a difference in gas between different companys.
That's because there aren't any major differences for the most part. Yes some have better additive packages as far as oxygnators and detergents, but even the non-top tier products are plenty sufficient.
Not sure if some in here are confusing octane with gasoline brand.
I know multiple friends of mine who agree with me that the very close 7-11 gas is shitty compared to our local BP..
But maybe it's all in my head. Just throw out the extra change for 93 octane, I have a feeling the brands don't make much of a difference.