The chaos after Infection triggered EOTW behavior in pretty much everyone - with the distribution network down, and everyone and their grandma trying to fill up to get the fuck out of Dodge, individual gas stations didn't last more than 48 hours. What this means is, any gas-only vehicle/hybrid is apt to be of temporary use at best. Even if you happen to be in the close vicinity of a refinery or something, odds are it's blown up, or you won't be able to get to the gas. Your best bet to find any is actually traffic-jams of abandoned vehicles (an abandoned single vehicle probably ran out of gas).
Some of the better Flex-Fuel vehicles can run (sort of) on kerosene, or even (poorly) on heating oil - so you've got at least a *chance* of filling up from a tank at a house or a farm. A hand-cranked or Greentec pump is crucial here for speed, though.
Plug-in Electrics or hybrids are not quite as bad, but still a serious challenge. Unfortunately, Greentec generators capable of powering a vehicle for any meaningful distance were still on the drawing boards in 2019 - so you're left trying to find reliable external sources of juice. It's not quite as hard as gas - distributed electricity is/was, if not common, at least widely-adopted. Collapse will have wrecked a lot of it - particularly fragile roof-mounted solar - but even in those cases, the storage batteries themselves were built pretty tough, and may still have charging capacity - but if you're not experienced with working with electricity, don't go fucking around with raw wires - you're much more likely to just melt your shit. Use the plugs you have in the outlets that are presented and don't get creative.
There are significant downsides that - even if you can fuel it reliably - make vehicular travel unwise at best, a total clusterfuck at worst. Among those are:
What little there is, anyway: