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Old 03-10-2011, 01:32 PM   #18 (permalink)
Air-Hybrid
EcoModding Apprentice
 
Join Date: Aug 2009
Location: London, UK
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This site seems a good resource for comparing bike MPGs.
Of course, the figures are for engines pulling bikes and are often rider logged, so not any kind of 'bible', still...

Motorcycle Fuel Economy Guide

Using a bike with a shaft drive seems a good option.
Boxers should also have a lower CoG if they can be made to fit!

I realise that bike engines are usually skewed towards performance rather than economy, I just think the getting hold of a modern efficient & light, small-displacement car engine (in the UK) is going to be a greater battle.
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