I forgot to add, for the non scientific method ,I have been using Methanol and Acetone for a good 10 years in all my cars to get thry NY inspection and in every instance it improved my performance and lowered my emissions to a passable value what ever that was , since 10 year old cars still got to pass and just leaning it out didnt kill the nox. only lowered the HCs.
thats 12 cars X 10 inspections minimum.
I started trying lacquer thinner early 80s but that was wayyy worse HCs and black smoke.
ant that was even with 10 cfm of pure O2 into intake vacuum fitting. geeze what was i thinking then all were well maintained .
even the lawnmower,