If I drive 40 miles with uber before I get a ride request are those miles tax deductible?

I have a question about deductible miles on Uber.  I turn on my app soon as I get in my car because I never know if I'll get a request.  I always drive to Florence, ky.  Which is 40 miles from home.  I've never got a request yet for those 40 miles.  Also Uber is my second job for weekends or when I'm off work.  Are those 40 miles deductible even if I don't receive a ride request?