Internal Mono(b)log

Over at friction-facts.com they do some pretty cool testing. Recently released were findings on dirty vs. clean and properly lubed chains.
5-6watts for dirt is nothing to sneeze at!

Checkout the report here: http://www.friction-facts.com/media/wysiwyg/Cross_Test.pdf

If you like it, consider buying their paid reports – some pretty cool info in them.