Pooks:

I find that my car and bike computer never agree. I read someplace, I don't remember where, that a lot of different factors go into how accurate your car's odometer is (i.e. if tires are properly inflated). I drove a route the other day and according to my odometer it was 22.6 miles, I took my bike out yesterday rode the exact same route and it came out to be 23.66. Make sure your computer is properly calibrated and don't be discouraged. Stay focused on what you have accomplished thus far. Keep riding and enjoy yourself.