I only bother with a computer on one bike, and it's my runabout not even my main road bike. And to be quite honest I use it more as a speedometer I average at 20mph with that bike constantly but it's a very highly geared SS meant for errands within a 20 minute to 1 hour round trip radius.. when I'm on my main road bike and on the very rare occasion I'm riding with someone with a comp turned on the averages are much lower.. even though I know for fact I can push that bike beyond anything my runabout can do, and it's not like I'm slowing down to let my buddies keep up but keep up they do even if they wheeze and puff the whole time. If you really care about your speed, get strava and look for people who do segments you do with speeds/times similar to your own and you can find people you can push it with! I used to think I didn't care about speed either, but if someone passes me I'll often catch myself slipping into the drops and pushing myself... thank god not many people pass me out here.