Hello: This is my first thread. It's a pleasure being a new member of this group. I have read about the possible existence of a small diesel engine which is suitable for mounting on a bicycle. My internet research has uncovered such a diesel built in the 1940s or 1950s, but which has apparently now been discontinued. Estimates are that this engine is capable of mileage ratings in the neighborhood of 200 - 300 mpg. Is there a modern equivalent to this engine in existence, or under development?