As you move faster, in your vehicle, than the world around you, you age slower. This increases life spans.
But if you’re travelling in the opposite direction of the rotation of the earth - east, I think; I’m having a hard time visualizing which way that would be - wouldn’t you be moving more slowly than everything around you?
I THINK it would be everything moving slower around you. Rather than you moving slower than everything.
My hypothesis is that going opposite of rotation is that it would actually add more time than going with as you now add the time you get from things moving slower and you moving fast. We are “not in motion” while in this vehicle. Everything around us is.
Our “not being in motion” is excluding the minor arm leg movements.