Petrol price rises in the UK over recent weeks have stimulated interest in alternative fuelled cars according to independent monitor, CarPriceCheck. Since the beginning of March, car-buying activity for LPG (liquefied petroleum gas) dual-fuelled vehicles sold by Daewoo, Volvo and Vauxhall have risen by 31 percent. The trend coincides with news that Ford is to add equivalent power units to its best-selling Focus and Mondeo ranges during the summer.