My post was in no way any argument. I have PS copies dating back to WW2, and read Smokey Yunick's column religiously.
The 100 MPG carburetor myth where the old lady took her car back to the GM dealer because it had not needed gas in 3 months.
On the other end of the spectrum was Smokey's work with fuel and carburetion.
Now here is a link to something that has many of the characteristics of the old vapor carburetor, but may actually be the future of fuel delivery, and in the process possibly the elimination of all after treatment of combustion byproducts, by improving atomization to the point where the by products no longer exist.
Transonic Combustion | Ultra-high Efficiency Fuel Injection Systems
Even then you wont see fuel mileage double, unless your base for measurement is a worn out atrociously tuned engine a few miles from the scrap heap.
No fuel delivery system alone is going to fix all of the other problems with IC engines, but a systematic approach that addresses all of the efficiency issues could get an IC engine to 60% thermal efficiency. Check out the work by Argonne labs.
http://www.anl.gov/Media_Center/News...as-diesel.html
regards
Mech