Honestly this is absurd. These death machines shouldn't be legal in europe. That thing doesn't even fit in the parking space, even though the parking lot has the biggest spaces in the whole city. The Golf Polo is so small in comparison, it could even hide in front of the engine hood of the truck.
EDIT: It's a Polo and not a Golf, I don't know my cars, sorry for that!
Once again, most of your fuel, especially at speed, goes towards overcoming aerodynamic drag. A heavy vehicle with good health aerodynamics will get better efficiency than a light one with poor aerodynamics.
And is an Escalade more areodynamic that a Lancer? Or a Ford F-150? And for most people who drive trucks are they always doing highway speeds or in stop and go bullshit?
As I pointed out before there will only be a very small % of large vehicles that will be more aerodynamic than a 6 cylinder car. So again your argument is kinda pointless