But combustion engines operate somewhere around 50% efficiency? (i dont remember exactly, but I remember it being pretty bad). So the 10-20% lost through the ro

But combustion engines operate somewhere around 50% efficiency? (i dont remember exactly, but I remember it being pretty bad). So the 10-20% lost through the road and the (presumably) small amount lost through electric, battery-less cars may actually be less overall than from combustion engines. I am assuming that electric engines dont generate much heat if they dont have batteries and assuming that roads dont have the power on unless theres a car nearby.