I've heard of this once before. When I was in high school one of the janitors was said to have ran an old, blue Astro van on gasoline vapor, by a system he built and received a patent on. It supposedly got 50-60 mpg. I cannot confirm whether he did or not but his son, who went to the same high school, mentioned once that someone had offered to buy his dad's invention but he was holding out for more money. Being 17 years old or so, I never gave it much thought, until the next year when his son didn't come back to school because his dad was said to have retired and moved. Rumor was he finally sold his design and made a fortune. The whole thing may be hokey and the family moving may have been just a coincidence but it does make me wonder.
Sent from my iPhone using Tapatalk