MaDMaCKeM
Midfield
I have always had my camera set up to focus using the AE-Lock button (star button), so that you can track the car or subject when in AI Servo and shoot with the shutter button. Takes a bit of getting used to at first but it's much, much better.
Same here, even shown a few other people at camera club how much easier it is to shoot like that. Best advice I have been given on using my camera. Great for recomposing shots and locking exposure