Continuing stroke after-effects

One of the post stroke effects I think I have mentioned before is driving the car.  I have done some quite longish drives in the last year but my brain "feels" like I am going faster than I am. To me, 40mph feels like 50mph and 50mph feels like 60mph. So, I drive at slower speeds than I did.  I have no idea why this should be so.  I assume this is to do with the way my brain is processing data.

Also, time seems to be different. I take longer to do things and yet time seems to be going along faster - but this may just be me getting older!