The European Commission has proposed to increase minimum excise duty rates on commercial diesel in an effort to restore competition in the liberalised haulage market and reduce environmental harm. At present, excise duty rates on commercial diesel constitute between 6 and 18 per cent of a haulier’s costs, and vary widely among the Member States. According to the Commission, hauliers distort competition and harm the environment when they engage in “tank tourism” – making detours to purchase diesel in lower tax Member States. The current proposal aims to harmonise excise duty rates on commercial diesel, and thereby restore competition and reduce environmental harm, by raising the minimum duty rate from EUR 302 to EUR 380 per 1,000 litres by 2014, with an intermediate step of EUR 359 in 2012.