Model Year 2011 Fuel Economy Estimates
The fuel economy estimates published by EPA and displayed on vehicle window stickers are determined through laboratory test procedures prescribed by EPA regulations. Tests are performed by auto manufacturers, and EPA audits the results at its own test laboratory to ensure manufacturer accuracy.
The purpose of the stickers is to provide the consumer with a way to compare miles per gallon performance and estimated annual fuel cost. For model year 2011, the Chevrolet Volt and the Nissan Leaf required new calculations and a new classification: mpg-e or miles per gallon equivalency. The calculation is based on the EPA’s formula of 33.7 kW-hrs of electric energy being equivalent to one gallon of gasoline energy.
EPA classifies the Chevy Volt as a dual-fuel vehicle which is powered by both electricity and gasoline. The EPA label says that when operating on electricity alone, the Volt gets 93 mpg-e and can travel 35 miles per charge. When operating on gasoline, the Volt gets 37 mpg (the traditional measure) and can travel an additional 344 miles. The charge time estimate is four hours at 240V.
The all-electric Nissan Leaf garnered a 99 mpg-e rating and has an EPA estimated range of 73 miles per charge. EPA estimates the charge time at seven hours at 240V.
Even with new methods and calculations, no test can simulate all the possible conditions that affect fuel economy, such as climate, driver behavior, road conditions, and vehicle maintenance. Your actual mileage will vary. The FuelEconomy.gov Web site at www.fueleconomy.gov/mpg/MPG.do?action=garage allows you to enter your actual mileage to help you calculate and track your fuel economy compared to EPA estimates. You can also register online to share your data with other users.
