If I'm doing my (very bad) math right, I think that works out to around a max of 60 cents per liter of gas, if you want to offset it with direct carbon capture using this method. That's not completely insane.

However, How many plants (and at what cost for building these plants), would there need to be, in order to make a meaningful difference? For example, would a $100 billion dollar investment over the next five years make a meaningful impact?