2026 Kia Sportage Fuel system Problems

“Shortly after purchase (9/20/25), I noticed that each trip showed much lower gas mileage than would be expected/reported via the vehicle sticker. Initially, these post-drive reports showed mileage around 17 mpg (city-equivalent). We noticed this quickly-- after the first few trips made. I calculated the mpg in early October & my calculations showed 16.7 mpg. Over the next few weeks, similar mpg was calculated/showing. I reported this finding to Kia St. Charles (point of purchase) early-to-mid October & was told to keep calculating mpg. …”

“I was stopped in the left hand turn lane, then accelerated to cross 2 lanes of traffic. I then let off the accelerator, and applied the brakes to stop, and the brakes did not function. I then rear ended a vehicle in front of me due to the intermittent loss of brakes. It may have also been the propulsion system kept going. Either way the vehicle maintained the same speed of about 15mph until I collided with the vehicle in front of me which stopped me. The brakes worked fine again after the collision. There also was no Forward Collision Avoidance system that was triggered in any way. …”

“While adaptive cruise was engaged, the vehicle read Alabama highway 80 west state road sign and incorrectly interpreted the sign for a speed limit sign which is 55 MPH.The vehicle displayed a “80 MPH” speed limit sign on the instrument cluster and then began to accelerate. When I took it to the dealer for repair, the “turned off safety feature”.”

“I am reporting two separate safety-related failures on this low-mileage vehicle. The first occurred at 2,431 miles while driving on the highway. The vehicle suddenly lost propulsion and coasted with no throttle response, and multiple warning lights and messages appeared simultaneously, including braking, electronic parking brake, and driver-assistance warnings. A sudden, unexpected loss of power at highway speed creates a serious crash risk, including rear-end collision, particularly with faster or following traffic. …”