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number of people are running E25-E35 in various makes of cars and letting the O2 sensor system balance the tune out. Even if the computer and sensors don't get it tuned exactly correct, the higher octane helps to offset a lean condition. For me I'm using a better fuel and saving about 55 cents per gallon. Sure the old QX4 Infiniti has about 180,000 miles on it but I'd seriously consider doing the same with a new car after my experiences with the Infiniti.
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