Mr. Denis O'Sullivan:

With regard to the technical aspects, we are fully confident that there are no issues with natural gas. There are substantial differences between the chemical make-up of natural gas and LPG, and the technology has moved on a great deal. Some of the advances in petrol engines have brought that about, with the removal of lead from petrol fuel. That was part of the valve issue that the Senator mentioned. The engines being built today are specifically built for CNG. There is also the option, similar to what happened previously with LPG, of retrofitting natural gas onto existing diesel and petrol engines. We have conducted trials on that very successfully and they work without issue.