Uses between 6 and 7 liters of gas.

You ruined this car for me right now!

Uses between 6 and 7 liters of gas. Which is better than your pickup truck

But worse than a modern diesel wagon or even midsize (huge by European standards) crossover SUV like an X5. I guess about the same as a modern petrol wagon like a Passat Variant then? Which can transport way more stuff, fit adults in the back seat and should even be able to tow a medium sized trailer (not a huge motorhome obviously).

We've come a LONG way in efficiency for internal combustion engines. Pickup trucks suck, but outside of the US they're not very common daily drivers anyway... and we have smaller ones. 2.0 diesel Ford Ranger is about on par with the fuel economy you claim for the Polo (is it really THAT high?). Same for some variants of the Toyota HiLux.

Once you put those 5 people in it, it is slow as fuck. I had a renault alliance when I was 18 and 4 people in that meant that I couldn't get enough speed to get out of 3rd. And going over the mountain pass in my home town was 2nd gear and 30mph at Best, on a 55mph road. Incredibly dangerous.