High consumption fuel

[Pegas111]

Hello everybody

I just bought a used mirage 1.2 cvt 80ch year 2014, 115000 in counter, spark plug changed, air filter changed, oil and filtre oil changet too, no default in diagnostic, but i have a very high consumption 12L/100km !!! other symptom, an anormale vibration in idle engine, anybody can help me if you have solutions

I posted you two photos to help you identify the engine.

Sorry for my inglish im I am a stranger

Thanks