LEHR Propane Powered Outboards

I was in a local marine chandlery store today and spotted (for the first time) a propane powered outboard, by LEHR.

The fuel consumption chart looks quite interesting:
http://golehr.com/lehr-marine/fuel-consumption/

Defender pricing

West Marine pricing

Popular Mechanics: How an Outboard Motor Works

Tom Lochhaas wrote a review on About.com

Mark Pillsbury wrote a review for Cruising World

Jim Hendricks wrote a review for Boating.com

SailNet discussion thread

CruisersForum discussion thread