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.
I think more like tens of minutes a year.
This is shown by a set clock in the car not connected to satellite. If you set the clock in may, to the time on your cellphone, then drive until September, you will notice the clock in the car is behind.