Doing some quick math, I'm thinking he was about a .90 - 1.10 on our scale. (legal limit being .08)
Reason I say that is that in our terms (BAC), .40 - .50% (half of one percent) is considered lethal for most. In their crazy measure, 3.5grams/litre is considered lethal.
Now, he blew twice that and then about an 1/8th MORE (of the LETHAL limit).
If he blew a .90 or worse, a 1.10 (meaning more than 1% of his entire bloodstream was PURE alcohol), his ability to keep that truck on the road is amazing.
I didn't just multiply 18 x .08 because first, that doesn't make good sense, and second, if he really blew a 1.44 he should be poured into a martini glass.