A few months ago, someone posted a link to a company in Alberta that
markets a "Platinum Vapor Injector" that alleges to improve gas mileage
by 22%.  As I'm sure none of us are surprised, there is little data to
back that claim up.  Here is a link to a story that the CBC (Canadian
Broadcasting Corporation) show "Marketplace" did on the system.

http://cbc.ca/consumers/market/files/cars/pvi/index.html

Truly, your mileage may vary (YMMV).
Keith Adams
Calgary, Alberta, Canada
1986 Vanagon GL Westfalia