We now use, on average, 2.2 barrels (or 347 litres) of jet fuel per person per year
but from the place where they got that data (
https://industry.gov.au/Office-of-th...tember2016.pdf ) a quick calculation shows that automotive fuel consumption is over 700 l/person/pa !
Aircraft with sensible load-factors have person-fuel-usages similar to that of road transport.
Sure, rail is more fuel-efficient than road/air but the capital cost is very high with long construction times.
And as for sea-transport, I have no intention of spending 3+ weeks to get to Europe and another 3+ weeks to return.