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Originally Posted by brk-lnt
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.
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Thanks for responding, this is good to know. I filled up in Mass a month ago at a Cumby's and used mid-grade fuel. Ironically, I got the highest gas mileage out of that tank of gas and the car performed well, no pings. That tank of gas lasted for 9 days - even after driving up from Boston. Now it seems, I'm putting in gas every other day - the mileage with NH gas is definitely a lot less.
Do you know anything about the ethanol requirements in NH?