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I'm used to seeing a much smaller spread, like 10-30 cents/gallon, but I haven't looked lately as I haven't burned gas for a couple of years now.
On your Prelude, it could damage the engine if you run less than premium fuel in it. I'm assuming it cannot adapt to lower octane like more modern cars can. It sounds like your Civic can, and you might lose a little performance or hear some pinging, but for 80-90 cents/gallon, I'd try it out. Check with Honda's customer assistance line to see what they say.
I read in a car magazine 2-3 years ago that premium will yield about 3% better mileage than regular and eventually regular will be phased out. If the cost is close to 3% more, it's a draw. I might be mistaken, but I believe Chevron premium has more Techron than their regular, so there's other benefits. Many feel they make the best gas, I dunno.
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