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If you are happy with the 155s and know the safety limits of your vehicle and drive accordingly all the more power to you. Its only when you don't know this that you'll get into trouble. I'm sure the 155s will net you better mileage. BTW, 155s are the stock size for a Toyota Tercel which is only a tiny bit smaller than your Civic. I wouldn't worry about breaking the bead, especially if you have them pumped up good.
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