In this case 'gas' is an abbreviation of gasoline
Gasoline - Wikipedia, the free encyclopedia
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In vocabulary there is a lot of US influence: Canadians use billboard, gas, truck, and wrench rather than hoarding, lorry, petrol, and spanner.
source: AskOxford: Types of World English
Does it mean that billboard = hoarding, gas = petrol, truck = lorry and wrench = spanner?
I don't understand that gas is the American equivalent for British petrol... I thought that gas is gaseous, while petrol is fluid... Is it really the same?
Yes. In that order. You're correct.
As for "gas" and "petrol", it's the stuff you put in your car.
All the best.
Thank you very much!
You're most welcome, Lenka.