Use Mometum 99 or Shell VPower 99. I believe on the flap it should say 98/(95) RON, so 95 RON for emergencies only. Unless you are in countries where 95 is the highest you can get. Not sure how long your Cupra lease will be...but I'm guessing they will come with Conti 5P tyres, they will go quickly and are not the best (from consensus of everyone).. so keep an eye out for good deals for Michelin Pilot Sport 4S tyres, might suggest if a good deal comes up, just buy the tyres in 235/35 R19 size, and store till you need them. You are likely to need to change tyres prior to the end of your lease.. I would say drive it 'normally' but not foot flat / till redline for the first few hundred miles...as always, wait for engine to be up to temp before giving it some.

Is using 99 noticeable ?
We use it currently as Tesco are our closest petrol station but I can’t tell the difference. Wife says it gives more mpg
 
Is using 99 noticeable ?
We use it currently as Tesco are our closest petrol station but I can’t tell the difference. Wife says it gives more mpg

My personal experience on a non-Cupra is that it does give more mpg (according to the trip computer) but not quite enough to offset the extra cost over 95RON. On a Cupra however, you may get 'loss of power' from 95RON. For me, I didn't feel any difference in power between 95/97/99RON, then again perhaps that's because I only have 150odd bhp to play with.
 
My personal experience on a non-Cupra is that it does give more mpg (according to the trip computer) but not quite enough to offset the extra cost over 95RON. On a Cupra however, you may get 'loss of power' from 95RON. For me, I didn't feel any difference in power between 95/97/99RON, then again perhaps that's because I only have 150odd bhp to play with.

Wife’s got the T3 manual 2017 plate.
 
Yeah. We ordered the T2 but paperwork got messed up so ended up with the T3.
Had a T2 as courtesy car and it was way slower. We get 50mph on a decent eun