I'm making a list of vehicles, and I'd like to add the type of fuel used in engines of said vehicles right after the engine size, which is rather easy when the fuel is diesel, because that's abbreviated as D, so
2.0D / 2.0d
But the problem is when I would like to emphasize that it's a gas/petrol engine. How can that be labelled? To me, the most natural/intuitive way would be
2.0B / 2.0b / 2.0ben
because in Finnish (my native tongue) it's called bensiini or bensa (from the word benzine/benzene/benzin), but then in English it's either gas/gasoline (US) or petrol (UK). So if I'd use that elsewhere than for my own personal usage, nobody would understand.
So, is there a common or understandable way of abbreviating said fuel in English?