I have a Toyota rav4 plugin in europe. Gas costs 1.7€/liter, gets about 6l/100km for about 10.7 cents per km. On electric it goes about 73km for 14kwh which costs about .60€ per kWh which is about 11.3 cents per kWh. Of course the at-home rate is about half this cost so you will do better there, but fast-charge rates are about the same gas and electric.