[matt55]

Originally Posted by LOWDOWN

You're missing the point. "When you are producing 500 hp, you are burning 500 hp-worth of fuel."

I own a tweaked '87 Regal Turbo-T. Yes, I can get nearly 30 mpg with the car...but NOT when I'm demanding it deliver "500 hp"...

And THAT is the "lie" for this supposed "new-tech" forced induction solution. Idling along on the EPA drive dyno leads to erroneous F.E. numbers (even when "recalibrated"). Put the vehicle to its intended use, especially in a truck environment under load with a gasoline engine, and F.E. flies out the window.

Diesels are different, especially in a truck environment. In trucks, they barely recognize a load, as far as F.E. is concerned. Their F.E. degradation, unloaded vs. loaded, is nominal in comparison to a gas V8. Some gas V8s, when towing to max rating, drop in HALF or worse. You don't see that with diesels, when towing the same weight.

You know then you do not tune a F.I. car at 12.5-13 a/f on 93 like a N.A. motor , you would (a least I did in my turbo cars) shoot for +/-11.5 a/f .
So using more fuel to get same hp per air flow ...