What does it mean for customers?
Confusion and contradiction, even at the European level, demonstrates the problem for motorists. Harvest says B30 delivers greenhouse gas savings of around 15% from well to wheel, a figure independently verified by the Renewable Fuels Agency, which audits the government's Renewable Transport Fuel Obligation. The fuel is also audited on a range of other sustainbility criteria.
But, the response to our calls reveals very different views on its suitability for modern diesel engines. Perhaps there is a degree of over-caution pending further tests of B30, but questions remain over its compatibility with sophisticated components in diesel engines that run to ever-tighter tolerances.
One thing is clear: ignoring manufacturer advice - or missing the small warning notices posted on B30 pumps - risks invalidating warranties. That could mean expensive repair bills further down the line.
