Statement:
An average person in Tonga drinks less alcohol than in Congo

In the Alcohol average daily consumption rating Tonga holds position #121 2016 out of 189 and Congo is #85 out of 189 2016.
Position of Tonga is better than position of Congo.
Both countries holds average positions in the "Alcohol average daily consumption" rating. So Both sexes is an average for both Tonga and Congo, compared to most countries of the World.

Referencies:

  1. Alcohol average daily consumption 2016 by WHO
    The countries in the rating sorted by 'Both sexes' in descending order.
    Congo 'Both sexes' value is 32.7
    Tonga 'Both sexes' value is 23.1