To obtain a more accurate calculation you can specify the correct car size. Here is examples of the choices available based on fuel type:
Small:
Petrol: Ford Fiesta, Opel/Vauxhall Corsa, Toyota Yaris
Diesel: Volkswagen Polo TDI, Renault Clio dCi
Hybrid: Toyota Yaris Hybrid, Honda Jazz/Fit Hybrid
Electric: Renault Zoe, BMW i3
Medium:
Petrol: Toyota Corolla, Volkswagen Golf, Honda Civic
Diesel: VW Golf TDI, Ford Focus
Hybrid: Toyota Prius, Hyundai Ioniq Hybrid
Electric: Nissan Leaf, Tesla Model 3
Large:
Petrol: BMW 5 Series, Toyota Camry
Diesel: Range Rover SUV, Audi A6 TDI
Hybrid: Lexus RX 450h, Toyota Highlander Hybrid
Electric: Tesla Model S, Audi e-tron”