Octane booster does NOTHING to reduce emissions... In fact, too high of an octane can actually increase emissions.

All an octane rating tell is the fuel's RESISTANCE to ignition. Too much resistance, and you will have an incomplete burn situation creating more HC.

"A young man who does not have what it takes to perform military service is not likely to have what it takes to make a living." - John F. Kennedy

Proud owner of an 88 Montero (with a blown engine).