I'm not speaking about density but efficiency, billions in r&d has been poured into combustion engine r&d and no engine reach more than 30% efficiency on the ca

I'm not speaking about density but efficiency, billions in r&d has been poured into combustion engine r&d and no engine reach more than 30% efficiency on the car sold. It mean 70% of the energy spent to produce this fuel is going to be lost. Meanwhile batteries range is improving every year, and electric engine easily reach 90% efficiency.