I'm now driving a car with automatic transmission for the first time in my life. For my liking it changes gear at too high speeds - 1st to 2nd at 15mph, 2nd to 3rd at 30-35mph and 3rd to 4th at 50-55mph. I would prefer it to change at 15, 25 and 35mph - does anybody know if it's possible to do this, please, and if so how?