GMC Acadia denali 2015 high fuel consumption
 

Welcome. I travel to Poland GMC Acadia Denali 2015 year. cool car but slept a lot of gasoline, with gentle driving on local roads at 55-65 miles, the car burns an average of 12.4 mpg. my mechanic connects the computer and says that everything is ok and the car is about to burn gasoline. On the forum give lower consumption, please advice.