I'm not sure about overall MPH, but I think you will notice a difference. I went from about a 21-22 lbs. road bike to a 16-17lbs bike and noticed a major difference. The climbing part was easier and the bike just seemed much lighter to me. I did go from aluminum to CF, so the increase in the quality of the frame (less flex, more power transfer) logically makes sense to me that it could potentially increase your speed, but how much? Who knows. Just saying I was in your shoes and noticed a significant difference in quality and acceleration.