Keep in mind your reaction time does not subtract from your ET. Many people think if they are sleeping it the tree that it costs them in the long run for time slips. This is untrue for guys that are just looking to get a good ET , not racing competitively. The clock does not start until after you cross the line.
I know this is common knowledge for most racers, but you would be surprised when talking to customers how many are not aware of this. Just figured I would help drop some more knowledge on the newbies out there in case anyone was unclear.