[beatr911]

As an ecomodder, I think you are right on!

As much as I like clean air, I also believe in just plain burning less fuel. It's too bad we don't have the readily accessible and reasonably priced ability to trim excess fuel from our EFI mappings. Areas in cold start, transitions, WOT and decel are often richer than they need to be just to satisfy hydrocarbon emissions. Really probably any operating regime in open loop is too rich. Decel on my Focus doesn't cut fuel unless I'm over like 3000 rpm. I rarely even run it over 3000 rpm.

If these, and maybe other areas were optimized for fuel efficiency (with emissions be damned!) I wonder what MPG gains could be realized.

If supercritical injectors created a much more complete and therefore cleaner burn the cats could conceivably not have enough fuel to stay lit. Would the supercritical injector burn be clean enough to render the cats redundant? I guess we may see someday, or we may not by thier absence from the market.