 Thus biofuels such as ethanol are now used all over the world as an alternative fuel in internal combustion engines.While complete substitution is not yet common throughout Europe, countries like Germany have been using E10 fuel (consisting of 10% ethanol) since 2011.E10 fuels have replaced the previous E5 fuel, containing 5% ethanol; although this may seem like a slight increase in ethanol use, this increase reflects a more progressive Europe as improvements are being made based primarily upon environmentally conscious efforts, rather than geopolitical or economic pressures.