SEAT
Leon Mk1:
Kerb weight from 1210 - 1628KG
at the maximum kerb weight of 1628KG, this means that each tyre must be able to carry at least
407KG (814KG across each axle)
if you look at the link in my original post, you will see a table that shows the Load Index and from that you will see that the Load rating 77 equates to 412 KG
The issue here is that the tyre, regardless of being XL rated or not must be able to handle the manufacturers permitted maximum laden weight.
The Michelin Pilot Sport 3's I have fitted to my
MK2 Leon are not XL tyres & have a load index of 91, which if you cross reference this to the Load index on the link indicates a load rating of 615KG for each tyre 615 x 4 = 2460KG
so the crux of the issue is not whether you need to have XL tyres, but the need is to get tyres that have the right load index to carry the weight of the car + passengers + luggage and all the other crap you carry about (weight of fuel etc)
any tyre fitter that say's you specifically need XL rated tyre for your Leon is talking out of his ars3h0le
you don't
need XL rated tyres for legal purposes, but you may
choose to have them fitted if this is your preference
There is a subtle difference