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I’ve always liked the idea of small diesel engines for mileage gains over gas versions of the same vehicle. Had the opportunity to put some kilometers on the diesel versions of 2006 2.8L Jeep Liberty and a 2007 3.0L Jeep Grand Cherokee. Both vehicles had new tires and wheel bearings and brakes installed, front and rear, but the gains were only slight. Having driven both gas and diesel Volkswagens, I was quite disappointed by the Jeeps and had expected more.
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