Statement:
An average person in Saudi Arabia drinks less alcohol than in Tonga

In the Alcohol average daily consumption rating Saudi Arabia holds position #144 ²⁰¹⁶ out of 189 and Tonga is #121 out of 189 ²⁰¹⁶.
Position of Saudi Arabia is better than position of Tonga.
Both countries holds average positions in the "Alcohol average daily consumption" rating. So Both sexes is an average for both Saudi Arabia and Tonga, 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.

   Saudi Arabia	'Both sexes' value is	8.1
   Tonga	'Both sexes' value is	23.1