My guess is, they will mile/tax electric vehicles first. Then gas/diesel vehicles will soon follow.
The fuel tax will remain in place.
Then some elected officials will decide to put a mile tax on all electricity. That way people who don't drive or own a vehicle can help pay for highway maintenance. It will be called a 'temporary' electricity tax.
And we all know what that means.
Pennsylvania is considering tolling some interstate bridges to pay for repairs.
Of course, it will be a temporary tax.