What you think of this for a 0 pollution motor thats super efficient?
http://www.engineair.com.au/index.htm

One could actually pump a tank full and drive a vehicle around without any emissions!
I imagine a bicycle setup to run an air compressor filling an air tank would be the way to go

i guess ytou can't drive far with one tank of air, but i like the idea

nice idea!

That can't work only with air maybe if you have pedals except gas