I have a 2012 Diesel (1.6 112 HP) Ford C Max.
Last Monday, I noticed that fuel consumption jumped by 40% ! In the beginning, I was blaming some cold weather that day. But then, the temperature returned to the normal (16-18°) and the consumption is still very high.
The only habit that changed is that I just put in the tank what I need for a week (1/4 of my tank's capacity). So the vehicle's tank is at his lowest on Friday/Saturday. And I enable cruise control whenever I can even in town.
How to explain it ?
Edit Didn't notice but my car doesn't heat anymore. Can it explain high fuel consumption ?