Step on gas, RPM goes up but no acceleration, at times can not get over 35mph. On even terrain with cruise engaged speed will drop and then rev back up. This only happens occasionally. Have been back to the dealer X3 but with no engine codes fired they can't locate the problem. Safety concerns of not being able to maintain speeds on interstates and county roads. Several consumer forums state common concerns relating to possible turbo, transmission and/or gas line issues. Kia not responsive to consumer concerns.

- Ringlw, WI, USA

When I placed the vehicle in reverse, it felt like the car lunged stopped and lunged again. The car did not move, because the brakes were still engaged. The review camera did not turn on. I backed out and pulled back into my spot, put the car in park, put it into reverse again, and the lunging occurred again. I checked the reverse lights, and they were not on. I proceeded to drive to my destination. While driving at 40 mph, I attempted to accelerate, the car revved to a high RPM, and then engaged the transmission causing the tires to chirp. I attempted several times to accelerate to proper speeds, and the high rev prior to engaging the transmission occurred every time. I noticed the gear indicator on the odometer display was missing. When I got to my destination, I turned off the vehicle. Then I turned it back on, and the vehicle was operating normally.camera, reverse lights, and gear indicator was working. I started driving and attempted a passing acceleration, with no issues. I did not take it to the dealer, because the vehicle is not having the problem at this time.

- League City, TX, USA

I purchased a 2011 Kia Sportage Mar 2011 w/ 12 miles on it. The mpg range on the window sticker was 22 city/27 highway (18 min/32 max). Shortly after the gas mileage was poor. I drove the vehicle for 500 miles figuring that should break it in and hoped the gas mileage would improve. It didn't, but got worse. I returned to the dealer in may, the vehicle had 504 miles on it and was getting 12 miles per gallon. Dealer ran a fuel consumption test and ECM upgrade stating that should fix the problem. I drove it another 700 miles but the mileage didn't' get better. The service mgr stated that a BCM upgrade was performed and that it was getting 29.3 mpg on the highway and 24.5 mpg in the city. I have never mpg in the 20 range. It has been in the teen range on the computer & in actual calculations. The service dept mgr told pay no attention to the computer on the car, yet it has been accurate w/ the actual mileage. We drove the vehicle out of state, the mpg was not consistent. Upon our return from our highway trip the mpg dropped significantly to range from 13.3 to $15.70 driving in city. We returned the car a 3rd time in Aug 2011, the dealer did a fuel consumption test again. They had my car for 11 days. The only thing they did was replaced the computer on the 2nd to the last day not knowing what else to do. Continuing to drive the car, the highest mpg I got was 16.89 mpg. When I fill up the gas tank, the computer on the car shows that I should be getting 308 or 309 miles on the tank of gas, by the end of the tank, I only get ~ 200 mpg. No explanations are given for this. I lose 100 + miles per tank. I filed a lemon law case and lost because this wasn't a safety issue. Kia usa has refused to deal with the issue at hand. Since there are no "codes" being issued by the car, Kia says there is nothing they will do. As of today June 2012, the mpg is still 15.87 mpg.

- Bryan, TX, USA