Only had them in for about a week, but they seem to be working better than the stock Motorcraft batteries. All start ups (cold and hot) are more immediate and firm than i remember with the stock batteries. I'm very happy with the purchase. I dont run a whole lot of extra electronics just an additional tuner screen and that isnt sucking much juice. It was really just time for new batteries and AutoAnything had a killer price. Highly Recommended...only time will tell if these yellow-tops hold out.
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