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London Fixed Gear and Single-Speed is a community of fixed gear and single-speed cyclists.
@deleted
Fuel economy on a modern bike is a highly movable feast. It's governed by your right hand for the most part - far more than any inherent design. You can get a 50+mpg down to single figures with ease, and visa versa. Unless it's been chipped/Dyno'd to arse and back of course.