That's pretty cool. How much is that? "Costa Coffee" (a UK chain) machines are in lots of petrol stations nowadays, but I'm not aware of any kind of subscription.
For the standard 240 ml cup it costs 349 kr a year including the cup, if you reuse last year's cup it's 299 kr and they apply a sticker to the cup to say which year it applies to. Or you can buy a fancy vacuum cup at 499 kr a year. If you register for Circle K Extra and use more than a 1000 litre of fuel a year (800 litre if you pay with a Circle K Mastercard) then you get the standard cup deal free. 1 GBP = 12 kr at the moment. So the standard cup is a bit under 30 quid, 25 to renew. So if you use it even only once a week it pays.
