tweake: one factor with hybrids/phevs is they are hard on the engines. this does vary a HUGE amount as it depends on the specs, battery size, range its driven and how its driven. the simple problem is running engines cold. great if you can do your short trips on battery alone. terrible if you can almost do it and run the engine a tiny amount. this is where BEV will shine. where hybrids work better is longer range where the motor can be used under decent load to put a good amount of heat into it for long enough.