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First, realize there are only a few companies that make all the batteries. Second, go with one that includes a good warranty, something like a 3yr replacement.
First off, the automakers conduct mpg testing in an enclosed controlled environment on a dyno. Second, not all trim levels are required to go thru the testing.
https://www.capitalone.com/cars/learn/finding-the-right-car/how-do-automakers-calculate-fuel-economy-and-range/1683
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