I've played GT1 thru 4.
I've done "fun" drag racing days.
I've been to performance driving school.
I've been to Racing school.
I've driven dedicated race cars "spec ford and Renault" on a closed road course (BIR raceway).
I've used my 98 Integra GSR as a daily driver and a race car (gutted interior, custom racing suspension) on closed road course (BIR raceway and others).
And I've done sanctioned auto cross events.
I still currently hold a sanctioned High speed event license that allows me to race on most of the big raceways around the country. My dream would be to run on Laguna Seca someday. In fact, I'll be racing my VX in some auto crosses this summer.
So yes, I do have some background in racing.
It has helped me very much with saving gas and keeping my car from being smashed by idiotic drivers on the road as well.