This is my first attempt to make a steady rpm engine under a load run on gasoline vapors instead of liquid gas.
It took me a minute to tune it in so it would run good.
The basis of this is typical internal combustion engines are only 20% efficient.
With warm fuel using this technique in a larger scale I expect to get closer to 80% efficient.
My truck gets about 20 mpg.
With this sort of setup with some tuning and custom linkages it should get 80+ mpg with no change in performance.
More testing to come when I get the extra cash and time.