Not a lot really, replaced front tyres. rear ones will go on forever.
The 16 is has to be one of the most comfy cars on the road.
I did the trip Melbourne to Perth twice and it was brilliant.
I got around 30mpg overall which is not bad for an auto car.
So in 27 years nothing you've owned since measures up to the Renault 16TS?
That doesn't say much for the cars you had since then.
I owned a US-market '71 R16 for a while back in the early '80's and while it was in the vanguard of fwd cars in the US, it was hardly a stellar example of construction quality. It did have a lot of features that were unusual for the time. It was hard to find anyone who wanted to work on it, and even back then, parts were hard to find, too. I think the few actually sold here have long since vanished from the roads.