Ok. The moderators rejected the initial review for being uninformative...
I add....
I poured AI 92 for 35 rubles-the car did not take off like a Boeing 747, but it did not get worse (almost everywhere in the city anyway 50)
Refueling is like refueling. No worse and no better....
There are no discounts (a points system when you need to buy non-fuel at an inflated price for a certain amount---this is an imposition of additional services, not a discount)