Well yes, but with a specific energy about three times the one of gasoline and a specific density of about 1/4 of gasoline the reduction in energy per unit of volume isn’t so massive and the benefits on the reduction of negative externalities is very very significant. Please correct me if I am wrong but in theory we would need deposits that are 33% bigger in volume, correct?, the problem is the temperature necessary to keep it liquid of course. And as important volume is, weight may be an even bigger factor for some transport systems, like airplanes.

In any case the point, as you mention, is that with more and cheaper energy we could sintetice the fuel.