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Okay here is the scoop from my point of view. If your car is stock use at least 90 octane or higher, Furthermore Do tune -ups when they need to be done. If its gas mileage you are concerned about go buy a hybrid. When I bought my car with 98000 miles on it it had factory air filter factory plugs and probably factory wires. My air filter was so clogged full of shit and I still got 23 miles to the gallon on the first 3 tanks.1 tune up later I am achieving 28 to 31 mpg. I could really care less about gas mileage though. I bought a performance car for 1 reason and that is to perform. Whether it gets 3 mpg or 30 mpg I am still gonna drive it!!!!
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