[Gent]

Methyl hydrate simply burns very cleanly - it combusts leaving only CO2 and H20. By adding it in high concentrations to decent fuel, you automatically improve your emissions. Too high, and you may have trouble running properly without adding nitrous, lol.

Aircare in BC sticks a sniffer up your tailpipe and measures the chemical parts per million coming out the tailpipe on a rolling road. They have a list of acceptable measurements for all the vehicle makes and models by year of production.

The downside is that it is corrosive to alluminum in the long term. Safe enough for a quick test, but not something you want to run every day.

edit: Mohawk/Husky 93/94 octane also has 10 % ethanol, which helps in similar fashion...