I don't think it would be that easy or practical to make a business of it because there is so much snake oil on the market today. Your chances of escaping the quagmire of fuel saving devices to get any kind of market share is infinitely small.
There are online engineering programs for making various pieces of equipment, such as strut mounts, air dams, vortex generators, heads, skirts, valves and the like. I'll see if I can find it and then people can wing some Ideas at everyone else into the collective pool. Have a group buy on some MPG increasing objects, now that would be something. Hell, you could even have the ecomodder logo etched into all the products, that would get the word out.
