Fiat Bravo Fuel consumption

Hi, have for some time the problem, which with my Fiat Bravo 1.6 l 16V the consumption increased enormously: almost 11 l per 100 km (formerly about 7 .. 8 l per 100 km). further signs: Oil smells of petrol, blue fog in the exhaust gas, exhaust gas smells atypically two more things: oil loss on the gearbox, starter crashes shortly after the engine is on (especially with cold engine) Does someone also have the problems (especially fuel consumption)? No one really wants to help me from the workshop. It w I just said: elaborate repairs .. rather live with the problem! Does it make sense to read out the OBD? Thank you in advance!