Most Petrol Kiosk in Singapore are fairly big.
In fact, one petrol kiosk near where I live has recently been torn down and they are building over it shops and studio apartments. I was quite shocked that they can fit in 41 shops where the petrol kiosk used to be!
This is up to now the smallest petrol kiosk I have seen in Singapore. Well, there may be smaller ones.
It reminds me of the petrol kiosk you see in small Malaysian towns.
Come to think of it, if you are traveling in rural Australia, it is also so small!