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Sadly, that old fiat isn't exactly environmentally friendly. Probably not much better than the Grenadier depending on the engine size and fuel. Unos from the 80s could be not far off 180g/km of co2 brand new, never mind after 30-40 years of running.
In reality, if you need a "proper" off-roader for work or because you live somewhere remote etc, then maybe the Grenadier is a good car. If, as we all suspect, it's targeted at suburban school runs, it's madness.
I know what I'd rather drive.