It's nitpicky, but the first thing I'd recommend is researching a realistic magnetic field strength for your device. If you're simply repeating what the manufacturer claimed, know that the number you were given is so far out of bounds that you've undoubtedly been lied to. Without knowing the size of the magnets exactly, I'd wager 1/100 (~800 gauss) is a realistic upper bound.
Regarding unburnt HC, vehicles haven't been tested for years without catalysts, so you have to go pretty far back to find unburned fuel figures. Here's one:
https://nepis.epa.gov/Exe/ZyPDF.cgi/...y=9100EXLA.PDF
In 1972, the EPA tested the Honda Civic, which did not have a catalyst. The explicitly list the fuel economy (22mpg) and the measured unburnt fuel coming out of the engine, uncatalyzed - ~0.18 grams.
With 50 year old technology, that works out to 0.13% unburnt fuel - around a tenth of a percent. Or, in other words, combustion
then was 99.87% complete.
Add to that, we're talking about a vehicle with a curb weight as low as 1300lbs, getting 22mpg. The equivalent offering 50 years later weighs 2.5x as much and burns 40% less fuel moving it around.
So, we can safely throw out unburnt fuel as a remote possibility. If this does in fact work (and none of it passes the sniff test), that's not how it works.