A two+ hour drive would really take it out of me. I would often have to stop and have a 10 minute nap.
I’ve found meds have really helped, I still feel tired, but I don’t have to sleep afterwards or take naps.
Same with riding motorbike, but double. I think it’s the intense concentration for long periods of time.
I had that problem, but I never thought it was ADHD. It turned out to be sleep apnea, and I had it for a while undiagnosed. I was 32 when I found out and not overweight.
I get the effect you describe when I am doing highly social things like parties, festivals, or public entertainment events. I attribute this to introversion rather than ADHD.