thanks guys

   Walking 20% actual work 70% lost as heat, and an additional 10% to parasitic losses and mechanical drag the above figure converts to about 72 MPG? (3.25 l/100km). Some motorcycles and a handful of very small cars are able to achieve such consumption rates in practice. Bus 200 to 300, Rail over 1000 mpg Bike 140 to 700 Aircraft over 100 and 15 to 70 for Helicopter. Hydrogen Space plane unlimited or Fusion Craft capital costs only.