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My old work truck (15L DD), I couldn't care about mileage. When my Durango does double duty, checking mileage is more than a number, in terms of cost, it also tells me if my mileage drops exponentially that I could have a mechanical problem and look it into it before it gets worse. When I went from my 13-14mpg empty to around 7-8mpg empty. I found out I had two problems; o2 sensor shot, and I had a bad injector. I wouldn't have known otherwise until the vehicle drove rough enough to illuminate a check engine light.
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