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When shopping for a new car, one of the most prominent features on display is the miles-per-gallon (MPG) usage of the vehicle. There is an EnergyGuide label for dishwashers, clothes washers and other appliances, and an Energy Star label for the most efficient appliances. But when buying a home, there is usually no information on its energy efficiency — which is strange, considering the substantial impact that monthly expenditures on electricity, gas and water have on disposable income.