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I have a friend who works at a Chevrolet dealership who told me about a service bulletin on the terrain. The fuel pump is leaking gas into the oil system. When you check the oil it is always overfull. After telling the GMC dealership about this they finally replaced mine. I was told this was a factor in the lower gas mileage. Too bad GMC issued this as a service bulletin and not a recall. I guess if my engine goes bad because of this they will be replacing it. Just got this done yesterday so I will see how the gas mileage improves.Report it
Ron apparently loves his Terrain judging by his ratings of other issues; getting fifteen percent less mieage apparently is a "Deal Breaker". First, General Motors does not certify the mileage ratings, The Environmental Protection Agency is responsible for all vehicle mileage ratings. In addition there are other issues other than speed which other members have cited. For instance, the amount of ethanol contained in much gasoline cuts mileage considerably and in proportion to the amount of ethanol in the fuel. Ron might try finding a supplier which does not use ethanol in its fuel; In some areas that is not possible and the ethanol level can be as much as seventeen percent. Another factor can be if the vehicle is used with the windows rolled down at speeds over about thirty-five miles an hour. Conversely, too low an air conditioning setting may require the a/c compressor to stay on longer since it is uses a cycle-compressor system rather than reheat climate control. Setting the climate control to a comfortable setting and letting it do its job is more efficient It seems a shame to be so condemnatory over mileage alone. The vehicle deserves better!Report it
I noted in your post that you say the mileage isn't 32 but you are driving 68 with CC. Most MPG figures assume 55 mph if I'm not mistaken, the faster you go in any car the worse your mileage will be!Report it
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