[kiloran]

Cheap tyres left to stand at the side of the road mainly. Tyre goes down slowly, sidewall gets folded, cracks and perishing happens.
Even on low miles (at £100 a tank I'll be surprised if I do more than 3000 in Val) I think all cars benefit from gentle weekly exercise. Fortunately our old petrol cars run up to temp quickly so they don't need many miles a week. I've got a 5 mile round trip which is ideal (the fact there's a pub car park at halfway is purely coincidental!)