Which models of the last 10 years are particularly favorable in consumption?

Hello, I would like to get a used car, if possible a year car, but no need. there is a list from the adac, but again and again I see at the dealer also cars that are not mentioned there and also have a good consumption. can you actually go so exactly according to the data from the adac or can you say kia models all have a low consumption or also a golf or polo diesel? can you possibly call a few models of the last 10 years which have a low consumption (max. 5 l/100 km) and are cheap in maintenance?