Thanks Hoosier
I popped back in a few times on Sunday without logging in and he was really pleased to your post.

Quote Originally Posted by HoosierGiant
"A bike turns 90% of your energy into movement, so it's the most efficient transportation in the world."
He is 16 and preparing a speech for later this week for his physics class on the energy efficiency of bicycles... I didn't even realsie what he was doing until he came and asked about your post.

Anyways, I googled something like...

are bicyles more efficient than cars

... and I got loads of links

Here are 3 I showed him

http://www.exploratorium.edu/cycling/humanpower1.html

http://www.eco-living.net/writings/t...effengine.html

http://gotoes.org/bikestuff/index.htm

One of these has pics of the guy towing a length of fence, a couple of trees, a couch and a piano!!! On his trailer with his legs as engines!!!
Pretty impressive!