I have 10824 miles on my Terrain. I purchased it brand new. Took a road trip this weekend. 75 mph. Checked the gas mileage again and I got 15.35 mpg on the hwy. That's far from the sticker of 24 mpg. That's why I chose this smaller suv over a larger suv. My driving was mostly flat driving. In town I average 13 mpg. I am ready to get rid of this vehicle. I took it in to the dealer this am. One of the dealership employess asked me what I was getting for gas mileage. He stated they bought the 4 cyl and they have 2000 miles on it and said the best they are getting is 19 mpg. This gas mileage is a joke. This is the 5 th brand new gm vehicle I have purchased and it is the only one that doesn't make close to what the window sticker said for gas mileage. I have had the fuel pump replaced several times and it seems the gas mileage is getting worse.