I kicked off having a look at this about e-fuels.
Definition of E-fuels
E-fuels are gaseous and liquid fuels such as hydrogen, methane, synthetic petrol, and diesel fuels generated
from renewable electricity.
The German Association of the Automotive Industry (VDA) commissioned a report published in 2017 “E-Fuels – The potential of electricity-based fuels for low emission transport in the EU”
Regards NeilIt concluded amongst other things
Key results of the study:E-fuels are necessary to meet the EU climate targets within the transport sector.Even in a battery electric drive dominated scenario, the final energy demand of all transport modes in the
EU will be met with more than 70% of e-fuels in 2050. The majority of these e-fuels will be used for aviation,
shipping and freight transport.