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i would add complexity. As you move up a model or add options you add additional equipment and that means more items to possibly fail. I would also add whether it is a new model or an existing model. Consumer Reports says that most cars are least reliable in the first year of a model's production before they have worked out the kinks.
Finally, one needs to be careful with stats like JD Powers initial quality. there are initial problems and there are initial problems. An engine or transmission that fails is in a different ballpark from a front grill that doesn't close.
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