I get 12 to 13 on stock and with the Gryphon I get just about 18 set on level 4. I have to clarify though that I have 37" tires and I know the speedo is off and I am getting better both on the stock and chipped MPG's.
Where I notice the most difference though is when I tow. Mileage does not improve as much as when it is empty but it sure helps out on regens and tranny temps. Regen'd three times on one tank of gas over labor day weekend on stock. With the Gryphon it would have been one regen over two tanks of fuel.
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