It is very common for drunk drivers to say they only had two drinks.
That is just enough to justify smelling of intoxicant but not enough to be over the limit.
Very few admit to the full amount that they had.
Every once in a while they will. The most I heard was two 24 can cases of bear in around 12 hours
"All I had was some beer in teeny-weeny glasses."
"How many teeny-weeny glasses did you have?"
"72!"