Global shift to mass transit could save more than $100 trillion and 1,700 megatons of CO2

[muriel_volestrangler]

9. I think energy in manufacture is far more, for anything imported by ship

Container ships are pretty efficient methods of transport.

http://en.wikipedia.org/wiki/Energy_efficiency_in_transportation

Domestic waterborne transport is more efficient, in kJ per tonne-km of cargo, than rail. If the figures given there for Emma Maersk are right, I think it can use 1kg of fuel - about 1.2 litres, or 0.3 gallons, to transport one 10 ton container about 45km, or about 28 miles. So it gets way better economy than a truck - about 100 mpg.