I started riding 7 years ago, and I bought a better bike in 2008. I've averaged 5500 miles a year since then. This year I missed getting mileage because of the cold and ice, and I missed 2.5 weeks because I had an upper respiratory infection. I'm finding that my average speed is a little less since I've been back on the back the last month, but overall I can't seem to average more than about 13 MPH. I do 20-25 miles a day, 35 to 50 on Saturdays, with Sunday off. We have lots of hills around here, so my climbing skills are good. but I'd like to get a little faster. Any suggestions?