W204 250 and 350 dillema(facelift PETROL)?

Hello everyone, as the title says, I'm having trouble to decide which engine to go with based on the fuel consumption. So, the question is, what is the average fuel consumption for both engines? If its a 2-3 liter difference I'd go for the 350 since its got a 100 HP more and its a V6 as opposed to the 1.8L turbocharged which would be a bit more economical but also seems like it would be "pushing its limits" for having 200HP on a smaller displacement. Any advices are welcome.

Thanks in advance!