Joined: Jan 2009
Posts: 44,223
Likes: 6,480
From: New York, NY, and High Falls, NY, USA
Bikes: 1962 Rudge Sports, 1971 Raleigh Super Course, 1971 Raleigh Pro Track, 1974 Raleigh International, 1975 Viscount Fixie, 1982 McLean, 1996 Lemond (Ti), 2002 Burley Zydeco tandem
If you move to a nicer bike, the speeds and travel times might not climb suddenly. I think the biggest differences it makes will be in reliability and enjoyment, but I can't even guarantee you'll enjoy it more. Ride yours a while and then test ride a nicer bike. You'll know if it's worth the money at the time.