Well-to-Wheel describes a subset of LCA, where the LCA is used to study the efficiency of fuels used for road transportation. The only way to compare fuel efficiencies is by looking at the way they are produced and transported to market and how efficiently and clean the fuels burn in an engine.
Contact start2see if you are thinking about switching fuels for your transport needs, or if you intend to put a new fuel on the market.
Comparing options? Only a well-to-wheel approach will tell you which alternative gives a better overall performance