[Opinion] Hybrid cars

Using saltwater won't last long because of the massive load of water which would been needed to get all the cars running. Normal cars, SUVs, sportscars and so on.
Additional to that saltwater can't get a car running than diesel/petrol or electricity does.
Also the salt in the water can affect several parts at the inside of a car, because, as we know now, producers are using low-budged parts.
There are some more reasons I won't list here.
The wear of the cars would be a mess.