“Saugfuel” – depending on the car brand Consumption differences?

Hello, I would like to ask the following question: Where does it come from that engines of the same power and engine capacity consume different amounts of petrol (at least according to the manufacturer), especially in urban traffic? For example (each inner/extra-urban/combined liter/100km) Suzuki Vitara, 1.6/120hp: 6.3 / 4.8 / 5.3 (sprit monitor: 6.3) Mitsubishi ASX, 1.6/117hp: 6.9 / 4.9 / 5.7 (sprit monitor: 7.1) Kia Venga, 1.6/125hp: 8.4 / 5.8 / 6.1 (split monitor: 8.8) C3 Picasso, 1.6/120hp VTi (older ones) Model: 9.0 / 4.9 / 6.4 (Spritmonitor: 7.9) All of the above examples of cars are about the same weight and size. Thank you! Greeting kappa13 P.S.I am aware that turbo gasoline or diesel are playing in other consumption leagues. I am also aware that fuel consumption contributes only a part to the operating costs – insurance, tax, maintenance, tooth/belts etc. must also be taken into account.