I wasn't saying go out and learn to drive using a gas truck - LOL.....
Just that my parents trusted me (and both my brothers as they came to the same age) to drive all the family vehicles as well the smaller work delivery trucks. Back then you could drive a 2000 gallon fuel delivery truck without having to get a CDL... that is not the case today - but back then was ok. I didn't just go out and start driving though - I did a couple of deliveries with my dad riding shotgun - and that was more about knowing how to work the tank valves and pumps than actually drive the thing - lol
I say that as my father trusted us kids with this stuff - we knew when to goof off - but that did not happen when it shouldn't.