The document discusses using Data Envelopment Analysis (DEA) to analyze the efficiency of energy use on UK farms. DEA was used to quantify the technical efficiency with which farms convert inputs like fuel, fertilizer and feed into economic outputs. The analysis found a wide range of efficiencies amongst farms, with some farms identified as more efficient peers for others to learn from. The DEA model also helped identify questions about less efficient farms and their potential to improve. However, DEA analysis also presents some challenges for farmers in terms of data demands, addressing farm heterogeneity, and potential implications for criticism or added pressure.