According to NIOSH (a federal health-related department), Gumout Regane is constituted with:
JP5 Jet fuel CAS 008008-20-6, 60-70%
Polyether amine mixture, CAS 999999-51-7, 30-40%
The "jet fuel" is simply a glorified carrier with detergent and/or dispersant capabilities. Perhaps someone else can explain the D&D significance and effectiveness of PAM.
Keep in mind that cleaners often have a flip side while cleaning, sometimes leaving deposits of their own (not all of the various solvents magically "dissappear" during combustion), or by slightly degrading certain plastic/rubber components over regular, long term use. If a fuel system is already "clean," using additional cleaning agents will probably do more harm, rather than help, even if subtly so. I certainly wouldn't use the stuff more often than the label indicates -- personally I only use such cleaners maybe once or twice each year.
Since these "treatments'" primary purpose is to clean fuel injectors, you can possibly use that as a guide. If a bottle results in a noticable improvement in engine performance, bump up its use. If not, you're probably not gaining much by using it on a regular basis.
[ March 22, 2005, 09:02 PM: Message edited by: TC ]