NORTH West bus maker Optare has signed a deal with a technology firm which will enable it to cut vehicle fuel costs and emissions.The AIM-listed Darwen-based firm has reached an exclusive agreement with the Hardstaff Group giving it rights to its dual-fuel conversion system for use in both new and existing passenger  vehicles. The technology enables engines to run on a mixture of diesel and bio-methane gas with benefits in terms of reduced fuel cost and considerably lower noise and emission levels. Optare said it had already ......for the full story register now for free or login below...