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gas mileage

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    Any ideas? loss gas mileage & higher RPMs at 60mph

    2007 G35 Sport Sedan w/ 105K miles I do mostly highway driving and monitor my gas mileage regularly. Recently I noticed a sudden 3-4mpg drop in gas mileage and the RPMs seem to be slightly higher than normal at highway speeds of 60+MPH. To me it felt like the car wasn't going into overdrive...