Here in the UK, we call them petrol stations. But "gas" is still appropriate, because 15 years ago LPG conversions were all the rage, and every petrol station had gas too.
Nowadays I can only think offhand of a single local retail fuel establishment that will sell you both US and UK "gas".
Nowadays I can only think offhand of a single local retail fuel establishment that will sell you both US and UK "gas".