[12foot]

Thanks for the info everyone.

Filled my tank 2 days ago, reset average and trip, (I don't pay attention to the real-time L/100k reading). I hope the average will come down as theorized in the responses. My reading currently is 15.1 L/100km, I've driven about 20km to work and back. Sat in it for 15 min during a lunch break to get warm, (yup it's cold out, -17°), and raced a guy who decided he wasn't going to let me pass (Please don't judge, I look forward to those moments). So time will tell, but it really does alarm me at the current spike in poor mileage from a month ago. All my previous cars only climbed slightly during idle, not continuously.