Отак вам, электрическим повозкам :

Please note that according to current regulation, in order for your electric or plug-in hybrid vehicle to travel on board our vessel, it will be inspected for the battery charge level to not exceed 40% of its total capacity.
For the rest alternative fuel vehicles, such as LPG or natural gas the filling of their tank must not exceed 50% of their capacity.
Thank you for your attention.

Это я глянул сайт паромной переправы, и сразу такое. Когда-то я там был, никто на газ не смотрел.