According to the display the mileage was down about 5 mpg for both instant and average. Today it returned to normal. Runs fine. I'm going to write it off as a temporary computer glitch.

 

i get that problem on my car, in Canada we run litres/100km but sometimes it does not seem to be right the car should get around 7/100km hw and 10/100km city, but the values sometimes stay at like 15 or 14 in the city and like 11 on the highway under normal driving load not hooning around or anything. so i don't usually trust it.