This presentation details the cost savings associated with the ownership of a hybrid vehicle when the overall ownership costs of insurance, maintenance, gas, and purchase price are evaluated on an apples-to-apples basis. Terry Hayes developed this evaluation process and presents it as part of the Wisconsin Sustainable Living video series, which is a partnership of Fox Valley area sustainability groups. Go to www.ecos-foxvalley.com to see the other presentations in this expanding sustainability series.
The label for plug-in hybrid electric vehicles displays fuel economy for both modes of operation.
The left-hand fuel economy box on the label displays the fuel economy when operating on electricity. This is described in miles per gallon of gasoline-equivalent (MPGe). Think of this as being similar to MPG, but instead of presenting miles per gallon of the vehicle’s fuel type, it represents the number of miles the vehicle can go using a quantity of fuel with the same energy content as a gallon of gasoline.
The right-hand fuel economy box displays the fuel economy when the battery is emptied and the vehicle is using gasoline. This is described in miles per gallon (MPG).
Both of these values represent the combined city and highway value. Combined fuel economy is a weighted average of City and Highway MPG values that is calculated by weighting the City value by 55% and the Highway value by 45%. Some form of the miles per gallon metric has been on vehicle labels since 1977.
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