I bought a case of Dynamo like 5 years ago. Did 4 tanks of gas with it, and saw no results in my Nissan Altima as far as mpg or noticeable performance.
Years ago when they had the garage off of Blue Heron Blvd I filled up my 370Z with the 85% methanol fuel. I remember getting back on I-95 to go home and it was like the car just wanted to take off. Thee car had noticably more power. I can't speak for the MPG because I drove it like I stole it.
Later I filled up my Prius at the station in Flagler that was selling the 85% fuel and I got over 60 MPG. I normally got 50 MPG. No check engine light or anything.
Shortly after that the municipality did their test and they got slightly better MPG. The reason was because their cars idled all day. At the end of the day they checked their engines for any abnormal wear and found them to be in the same condition as before the test. I spoke to the people who were driving the cars and one said she noticed no difference but the others said there was noticeably more power.
The municipality test fuel was mixed by Tom on a tank by tank basis. That test was proof of concept.