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I'm getting reduced gas mileage on my AGM upgrade for my Honda 2015 Civic. I know it's a lot of money for a battery for the car but I need reliable winter time starting but not the reduced gas mileage I lost 4 miles a gallon when I went to the agm. And that's keeping in mind I had a bad cell in the old battery. Which was starting fine in the summer just didn'...

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