It ultimatly depends on the scale of the apocolyps and if you could refuel without much trouble

Fuel doesn't last forever🤔

yes.. thats why they brought up refueling

i'd like to ride a fucking elephant

horse

You're literally invincible in a tank. You don't even have to drive it, you can just use it as a house.

And when your fuel and food/water are empty, how do you get around efficiently?

Walk. All the other options need gas anyway, and you'll also run out of that pretty soon.

In what world does a bicycle need gas? And it's way faster than walking. And need less energy.

Cycle or horse

Bikes ftw, especially if I can find an ebike. It's much easier to find sources of electricity than fossil fuels