I knew I had become a Stock Car Fan when...
...Tailgating became "drafting"
...I started calling slower cars "lap traffic"
...I started lightly tapping the cars bumper in front of me when I wanted to pass
...I started signaling the cars behind me to pass (they probably thought I was "flipping em off"

...I began timing my fuel stops
...I started calling every curvy road in my neighborhood " Glen"
...I found myself pausing after the traffic light turned green to get a better "restart" than the car behind me
...I miss a gear, it reminds me of Pocono
...I began hoping the car in front of me, would "go high" on "clover leaf" exits
and finally, ...I found myself cleaning "marbles" off my tires when I went slow