You pretty quick to put it down, but while using even the little W4G generator, I measured my MPG just from taking the same pump fill and the odometer readings. Mostly city, I get 16 MPG from HHO, and lately I haven't had one in because of work on my next one. I get about 12 w no driving changes...
W HHO-16MPG
W/O HHO- 12MPG
Call me wrong, as I'm sure you will. All I know is has helped me, I don't think its a random thing that I gained 4 MPG with a generator in, and with it out lost those 4. I did have the water4gas pullin a good amount of amps though.
But honestly if your just going to browse around this forum downplaying all of the work being put fourth here, why don't you just go do something else?
1995 Chevy Camaro
17 MPG base city/highway
Listening to Van Halen