I don't see 90% savings even if everything that your dreaming comes to pass.

A battery powered EV doesn't save 90%. At best it saves about 10%. But these gains are very fleeting depending on location and driving style.

We don't have the mining to increase LiIon battery production to make a car for everyone.
So, maybe you mean that 9 out of 10 people will not have a car, and so… we save 90% by making people do without.