I did some fact checking on FF consumption for personal vehicles.
Google tells me annual US gasoline consumption in 2017 was 142.98 billion gallons. To simplify, I’ll ignore diesel used in personal vehicles, which might roughly balance for lawn mowing, etc.
So, assuming 30% energy use efficiency, how many kWh is this equivalent to?
Google tells me there are roughly 9 kWh energy potential per liter of gasoline, so 3 kWh × 3.785 = 11.355 kwh. 11.355 × 142,980,000,000 = 1,623,537,900,000 kwh.
Multiply this by a further 15%, for charging and discharge losses. × 1.15 = 1,867,068,585,000 kWh.
Depending on line losses, and or grid storage losses you could be looking at an additional 30%. = 2,427,189,161,000 kWh.
Annual US electric generation is said to be 3,911,000,000,000 Kwh.
So to electrify passenger vehicles would take an expansion of the electrical grid by at least 62%, depending on timing of charging needs of consumers.
I stand corrected, I was relying on UK figures, maybe it was a figure for all road transport. It may also have been skewed by national reliance on natural gas.
This would not touch diesel or other transport uses of FF, the clearly most efficient (first choice mimimum losses) uses being overhead lines for trains, then following being for transport trucks on special routes as Wallace highlighted.
We could do a lot better by simply reducing curb weights, or improving urban planning.