Because the Prius plug-in operates as a series-parallel hybrid, the U.S. EPA estimated its EV range for blended operation on a combination of electricity (from a fully charged battery pack) and gasoline as 11 mi (18 km) until the battery is depleted.
In such a mode of operation the fuel economy is increased, but the amount of electricity consumed, normally measured in kWh, must also be considered.
A company planning to offer conversions to consumers named EDrive systems will be using Valence Li-ion batteries and have 35 miles (56 km) of electric range.
Both of these systems leave the existing HSD system mostly unchanged and might be applicable to other hybrid powertrain flavors by replacing the stock NiMH with a higher capacity battery pack and a charger to refill them for about $0.03 per mile from standard household outlets.
Though the Honda Integrated Motor Assist (IMA) systems does not have low speed electric only abilities blended mode mileage could be greatly enhanced while displacing some of their gas consumption with electricity from external sources.