I don't trust it in the slightest. I mean heck look at what happened to the other guys claiming wild things other than "meh, its oil" :
Slick 50: http://www.ftc.gov/opa/1997/07/slick.htm
STP oil treatment: http://www.ftc.gov/opa/1995/12/stp.htm
Shell 1999: http://www.ftc.gov/os/1999/09/shellconsent.htm
Shell 2000: http://www.ftc.gov/os/2000/01/shell.do.htm
EDIT: A summary for those of you who don't spend 9hours of your day reading FTC demands of oil companies
Every one of these companies was ordered by the FTC, after review and analysis of claims, to cease and desist all claims of:
1. Improved fuel economy
2. Improved cold-start protection
3. Improved acceleration or power
4. That they contain superior chemicals that allow such claims
Some got more than others but thats the basis for all of them.
AMSOIL did a dyno test of a bunch of different oils. Of course theirs came up as best (which I ignore) but its interesting to note that Royal Purple was rated 7th place.