I've barely driven this week, and last week as well. Severe thunderstorm warning last week at the time I was to leave for work so I opted for the car. Been to the grocery store a few times to do minor shopping on the trip home from work. Last night I rode home from work and scoped out the situation at a doctor's office for an appointment I had today. Had to check to see if they had available bike parking which they did. Rode to that appointment then home, lunch, and then ride to work. Probably won't have the car out until later this week as more severe weather heads my way. Will try to dodge that if I can on the bike.
As for mileage tracking, I am on Strava, not to compete, but to track everything easily. It all syncs up using my Garmin Edge 810 and my iPhone + Garmin Connect app. That is my main motivator right now, and so far it is working. Also dropped a few inches off the waistline which is always good.