However, both LPG and CNG still originate from fossil fuels, so the well-to-wheel emissions of green house gases are still high. Eyre, Fergusson and Mills(2002: 53) state that LPG does not offer lifecycle carbon benefits compared with diesel and conclude that LPG will have a rather marginal impact on either total road fuel energy demand or CO emissions and does not provide a pathway to non-fossil fuel transport. Electric vehicles Electric vehicles depend on batteries, which are still currently heavy and bulky and only enable a limited distance range to be travelled. Recent improvements in the distance range(now in excess of250 miles), however have led to an increase in interest in the use of this technology for van based home deliveries(MacLeod, 2007) and other van-based operations Smith Electric Vehicles, for instance, produce a range of smaller trucks(including a 9-t truck), where the batteries are stored on the underside of the truck. These are currently in use by a number of large UK companies Although electric vehicles are not yet capable of powering larger trucks there are many hybrid trucks on the road that combine electric and diesel power, Conventional axles can be replaced by electric