As they say, the PROOF is in the pudding.
There are literally thousands who are now adding these Enzyme Catalysts to their gasoline or diesel and getting good to great results.

The following are some of the testimonies that have come in, click the "go" button for personally written testimonial: ( Click "go" to get details)

1989 Chevy Celebrity: 22 mpg to 27.45 mpg = 25% increase!
Lexus RX300 SUV: 20.9 mpg to 25.6 mpg = 20% increase!
1996 Honda Odessy van: mpg to mpg = 20% increase!
2001 Ford F150 truck: 25% increase!
2006 Toyota Sienna: 240 miles per tank (mpt) to 302 mpt = 26% increase!
1998 Chrysler Voyager: 272 miles per tank (mpt) to 301 mpt = 10.7% increase!
2005 Toyota Solora: 22 mpg to 33.2 mpg = 51% increase!
1995 Lincoln Town Car: 19.3 mpg to 27.4 mpg = 42% increase!
2003 Dodge Neon: 20.2 mpg to 26.8 mpg = 32.6% increase!
1998 Toyota Avalon: 24 mpg to 29 mpg = 20.8% increase!
2004 Chevy Suburban: 17.6 mpg to 20.3 mpg = 15.3% increase
1991 Chevy pickup truck: 14 mpg to 18.5 mpg = 24% increase!
2005 Toyota Corolla: 286 mpt to 402 mpt = 40.5% increase!
Chevy S10: 14 mpg to 20 mpg = 42% increase!
2005 Chevrolet Avalanche: 15 mpg to 18.1 mpg = 20.6% increase!