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Brand usually doesn't matter too much. All basic 87 Octane gas and 93 Octane gas are virtually identical when manufactured. Notice I didn't say 89 Octane gas, well, that's because 89 Octane gas is not manufactured, it is mixed. Newer (within the past 10-15 years) gas stations have two holding tanks, one for 93 and one for 87. When you pump 89, it pulls a mix of 65% 87 and 35% 93 for a octane rating of 89. Older stations have 3 tanks and the fuel distrubitor hauls the mix seperately. The only difference a brand makes is when they add detergents and additives to their gas. Basic 87 Octane gas usually doesn't have any additives hence making most 87 octane gas virtually identical across the brand spectrum. So if you're buying 87, your best bet is to buy at a gas station that does a good amount of business, therefore keeping the fuel supply fresh. The fresher the gas, the less problems you will see like pinging and sputtering.

Higher octane gas will result in better performance and fuel mileage. The difference, however, is nominal. When I was tuning my old Mitsubishi Evolution I remember Dyno graphs that showed maybe a 5HP improvement with higher octane gas - not usually noticeable by the seat of the pants dyno that most of us use.

Personally, I'd recommend using 89 because you're more likely to get some additives that are added into the 93 octane gas. However, it really is a crap shoot considering it is usually 10 cents more a gallon which translates to 2-3 dollars a tank for most of us. Is 2-3 dollars with a few gas additives and a little better performance and fuel mileage? I think so.

As for brand, well, you could argue all day about who uses the best additives. I guess that boils down to whichever brand's advertising you like the most.
 
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