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The only real reason to ride fixed wheel is for enjoyment. There are marginal efficiency gains and perhaps psychological ones if you're the type who changes down as soon as it hurts, but mechanically gears are way faster in all circumstances. Except maybe a totally flat road on a totally still day with a perfectly chosen gear and perfectly judged pace.
Hefty
I agree, assuming there's hills etc. But there's a lot of fast fixed TTers out there who've presumably decided against gears for a reason. And in my personal experience the 'flywheel' effect of riding fixed helps to maintain speed once you're there.