A British company, Hydrofuel Technologies Ltd, is urging motorists to use water to reduce fuel costs with a car battery-powered onboard electrolyser, on its website, (www.runyourcaronwater.co.uk ). Hydrofuel’s DIY guide explains how motorists can convert cars to a water-burning hybrid to improve engine performance and save money. It says users of its system have reported mileage increases of between 50% and 100%. Nadim Hussain, the firm’s MD, says: “We want to spread the word that water can be used to help power a car alongside petrol or diesel, and introduce this technology to the UK on a large scale, so...