Something different Building for MPG.

Don't rule out turbocharging in any of the projects. The hidden benefit to turbos, beyond the force feed power when WOT, is the heat. Most run some type of cooler, to bring temperatures down to reasonable levels. It frequently does not get it below ambient. The additional heat better atomizes the fuel, for a more complete and efficient combustion. To compliment the turbo, alky or water injection. The alky has a side benefit in addition to the cooling, which is alcohol burns. SO if setup right, the alky can replace some of the fuel, further increasing efficiency. With the price of gas right now, a separate "bottle" of rubbing alcohol, for .79 cents that helps defer gas at 3-4 bucks a gallon, over hundreds of miles, is a excellent trade off.