BlueJay465 writes "On almost every news outlet, everyone is talking about the price of oil, both foreign and domestic. This sent me to do some research on what it would take to keep the investment in my current vehicle, while getting the added benefits of hybrid-electric technology at the lowest price. One company, Sigma Automotive, has already jumped on that bandwagon, and will soon be offering a kit for your car engine that will boost performance and increase fuel-economy by adding all the extra electronics, hardware and capacity (avail. Q3-Q4 2004). My question is, how much would it cost to really 'Do It Yourself' using off-the-shelf parts?"