Why does my Kia Pegas consume 10 liters per 100 km in the city with 100 currency units for 100 kilometers, even without using the air conditioning?

The tire pressure is enough or not?

Another question is whether the gas station filled up the tank for you.

Manual transmission, in the first year the car's fuel consumption was 5.5 L/100km in the city and 4.4 L/100km on the highway. With a full tank, it would light up at 650 km in the city. In the second year, the fuel consumption increased because of slow acceleration. I like to drive fast, so I always have a heavy foot on the gas pedal. Now it's 7 L/100km in the city, and the light comes on at 500 km with a full tank.

Have you done the maintenance yet?

I never exceeded 7.

Is yours a 1.4 or 1.6, automatic or manual transmission?

Normally, like you said, driving around the city.