Experiences Grand Vitara 3.2 “20 years”?

Hello guys, I’m about to take over my uncle’s car because he doesn’t want to drive anymore because of his age. The vehicle is a Suzuki Grand Vitara, 3.2 V6 as a series “20 years” with 232 hp and automatic. He bought the vehicle as a day registration with 100 km on the clock and the mileage is now about 19000 km. I know that it is not a gas suspect, because my uncle talked about something from 12 liters to 100 km, can you confirm that? I would be pleased to hear from someone who happens to be the same model and can tell me about problems or abnormalities that I have to pay attention to when using the vehicle.