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@Greenbank
No real speed difference for me. I'm as fast/slow on fixed as with gears. For really hilly rides I'm slightly faster on gears, this is probably from being able to rest on long descents.
I've taken anything from 7h05min for the 100km London Sightseer (it's a slow ride as it's a tour of London, the routesheet it 4 sides of A4!) down to 4h45 for a 106km straight blat up to Cambridge.
Moving average goes from 19.14kph (Elenith in 2009 on fixed) to 25.53 (DIY 200 Putney to Cambridge and back on fixed). One outlier was the 2008 Dean in horrendous weather where my moving average was only 17.79kph.
Add in at least 1h stopping per 100km. Closer to 1.5h/100km if you want to be sociable.