 found that the mean energy input/output ratios for miscanthus is 10 times better than for annual crops, while GHG costs are 20-30 times better than for fossil fuels.For instance, miscanthus chips for heating saved 22.3 tonnes of CO2 emissions per hectare per year in the UK (9 tonnes per acre), while maize for heating and power saved 6.3 (2.5 per acre).Rapeseed for biodiesel saved only 3.2 (1.3 per acre).