The ATA also recommends operators consider the benefits of buying bio diesel blends that comply with the diesel fuel standard, if they do this can be claimed under the fuel tax credit scheme for the entire amount of the blended fuel used.
(The success of the biodiesel fuel industry relies heavily on biodiesel testing, not only at the production level but at the consumer level, where degraded fuel may cause engine failures. Fleet Biodiesel's family of inexpensive biodiesel test kits is just a click away on the internet)