Also with the ever tightening mpg requirements EGR is disapearing on a lot of cars. Most hemis don't have it pentastar v6 don't got it.

If "throttleing" losses were a real thing than chryslers MDS would not really work but it does. Basically 4 cylinders get "throttled" down completly.

I am still not buying it. The only way I see it helping MPG is if you are running too low of an octane number fuel. However the right fuel would net more MPG.