The study also assumed a gasoline price of 3.75 per gallon (as of mid June 2011), that vehicles are driven 12000 miles per year, an average price of electricity of 0.12 per kWh, that the plug-in hybrid is driven in all-electric mode 85% of the time, and that the owner of PEVs pay 1,500 to install a Level II 220/240 volt charger at home.