I don't really understand your argumentative tack...

I just pointed out why in the 80s the turbo'd engine would get worse mileage. Other than when in boost - a "modern" engine will make the same mileage NA as boosted when not in boost. They didn't have as much control over things in the 80s - so it wasn't the case. They put more fuel to it and retarded the timing to make it work hard enough to burn the fuel at idle to pass emissions. That's just how they did it in "the old days".

I don't really care about your argument. I understand that the REASON manufacturers add turbos is for PERFORMANCE. Feel free to expend as much energy supporting the argument as you please - I have no dog in this fight.