Octane doesn't matter unless you have a higher compression engine. Use what is recommended in your owner's manual. If you use Nitrous
, or boost of some sort, then it's a good idea to use a higher Octane rating to prevent detonation. There is no power benefit between the different grades. As for which brand, they're all the same. They all come from the same refineries and tank farms. Typically most areas are serviced from anywhere between 2 to 4 different fuel farms, all of which get their fuel piped from the same refineries. The only difference may be a couple different additives, despite what the commercials claim. Typically, if someone says, "don't go to that gas station, they have bad gas, I had this expericence.." it's because that particular gas station's tanks are probably contaminated or have water in them or whatever. The fuel delivered to the gas stations has been filtered quite a bit so typically it goes into the tanks under normal conditions. Hope this helps!