Fuel consumption suddenly increased. Help

I have a 2010 model 92 HP partner Tepee. My average consumption was 4.5 lt / 100 km.

I bought fuel 3 days ago and reset the distance covered, as always. But then the average of fuel suddenly increased. Instant values are between 5-14 lt. The total average, however, did not fall below 6.6 lt / 100 km.

The traction sound of the vehicle is everything is normal. Filter and oil maintenance was newly done.

I think the fuel values have increased as the air temperature has dropped, but is it normal for this degree to increase?

While the engine waits in the lights without warming up, the average consumption increases like seconds. I saw 14.2. It declined when it accelerated