Relating to transportation.
In Fallout: New Vegas if you read the repair reports of our Spanish ghoul friend Raul, in Black Mountain.
He talks about how a Super Mutant wanted him to fix up a car, Raul says he can't do it.
So the Super Mutant
brings him a tank of gas, but Raul says
gas isn't the problem.So this shows that either:
A. Cars in Fallout universe don't run on gas, but some other energy source.
Or
B. That cars DO run on gas, Raul just couldn't fix it because the car is 200 years old and is just... junk.
Relating to the topic...
Spoiler The Boomers in the battle of the Hoover Dam (If you completed Volare) have a BOMBER ... FLYING.... BOMBING PEOPLE. So somehow air travel is possible.
We really need canon information on transportation in the Fallout universe, so we can be clear.