If you use Pay at Pump, it will now always be categorised as Transport. We even threw in a little emoji in the notification:
This works because, as pointed out above, there’s a specific Merchant Category Code (MCC) for Pay at Pump. We’ve set this up to override the merchant’s emoji and category (in this case Tesco, which is normally Groceries).
I’m afraid this won’t affect paying in the shop. Pay at Pump has its own dedicated MCC (“5542 Automated Fuel Dispensers”), which means we can be sure you bought petrol. When you pay in the shop, even if we looked for a “fuel” MCC, we couldn’t be sure you bought petrol rather than, let’s say, jelly babies… So this is just a little improvement 