Better explanation of the process: https://www.prometheusfuels.com/news/dude-wheres-my-fuel
($3/gallon) / (8.9 Kg/gallon) * (907 Kg/ton) = $306/ton
I.e. their goal is 3x more expensive at capturing CO2 than DAC. If you want to sequester carbon (e.g. by filling a cavern with this fuel), this is not the technique to use. The only reason to pursue this is to use zero carbon electricity to produce nearly net-zero carbon fuel.That's the only thing they market it as