Hi Jayjay, I haven't read the responses but I wanted to chime in with my own experience. I did increase by more than 10% on some weeks because I felt great. Take a look at my 2006 bikejournal if you want to see how I built up from being an absolute newbie to 100km in about 3 months (and that was on my mountain bike at the time.). Then I bought a road bike in July and rode even more! Now everyone is different so our miles may vary, and I was only 20 lbs overweight at the time so that could make a difference as well. BUT I was a complete couch potato who had done very little physical activity before I started.

Bikejournal for 2006

Good luck!