obermd· Premium Member
Not all of it. The OEM Fuelmax tires only add about 3-5% to the car's efficiency. Something else is at work here and I suspect it's the MAF sensor as we've seen this sensor cause up to 10% drop in efficiency when dirty.The tires that originally came with the diesel Cruze will yield you the best milage. You will lose milage with just about any other tire due to weight and tread compound. Matter of fact the OEM TPC rated FuelMax tires on our cars are different then the retail version. I can guarantee the tires are the cause of your lost milage.