These links may have been posted before. I'm researching for the LPG company I work for with regards to Diesel Substitution.
These are regarding emissions, there is full mention of Bio Fuels
Heavy Vehicles
http://http://www.environment.gov.au...lifecycle.html

Light Vehicles

Life-Cycle Emissions Analysis of Fuels for Light Vehicles

A very thorough overview & detailed report/s on alternative fuels- got a few days to spare??

Comparison of Transport Fuels - Final Report to the Australian Greenhouse Office on the Stage 2 study of Life-cycle Emissions Analysis of Alternative Fuels for Heavy Vehicles