I started riding a Sun EZ Sport CX with a Mueller fairing in Sept. 1, 2006. I typically rode 11-12 mph on my mountain bike. I started at 11 mph in September on the EZ Sport and now ride 13-15 mph and it is increasing slowly over time. Last Friday, I rode 53 miles at 13.5 mph. I could never have done that on my mountain bike. As your legs build and you lose weight, the speed goes up. I have lost 25 pounds since September. That helps quite a bit.