Methanol contains carbon.
https://en.wikipedia.org/wiki/Methanol
Somebody (them or me), missed something in Organic Chemistry.
Why not burn the hydrogen directly?
(Yeah. I know)
Here's one you haven't heard: Even when compressed to 10,000 psi, Hydrogen occupies 7 times the volume of gasoline that has the same energy content. This 7x size doesn't include the tanks to hold the hydrogen at 10,000 psi. The gasoline fits in odd shaped containers tucked into corners of the chassis. The hydrogen must be stored in round pressure tanks. In an accident, you don't call them pressure tanks, you call them bombs.
“Why not burn the hydrogen directly?”
Hydrogen is not easily used as a dual-fuel with diesel.