Which engine is best used in Omega A?

Hello guys! I’m thinking of buying an Omega A as a day-to-day vehicle! I’m not quite sure about the motorization! I don’t know if it’s better to get you a 3.0 12V, but there’s the high consumption again … the 3.0 24V consumes even less, but it’s supposed to be an everyday vehicle, so a 2.4 8V or 2.0 8V would have to be enough. and what about the 2.6 12V? I have to say that I already had an Omega 3000 12V, but very short! r me and I have to pay attention to what motorization?? mfg