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Originally Posted by IrishEyes
Unfortunately, my car requires premium gas, but I’ve been alternating between mid-grade level and premium. Does anyone know if this actually makes a difference in the performance of a car? Or is it just another marketing scam to get us to pay more at the pumps.
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Depends on your car. When then engine requires premium it is because the engine is designed to run at a higher compression, and the higher octane gas prevents pinging. Many modern engines will detune themselves if you put in lower octane fuel. It is not a "marketing scam".
Often times your gas mileage will decrease slightly when you use the lower octane gas. Sometimes it decreases by enough that the cost savings are wiped out by decreased MPGs.