[Number 3]

Well, first, let me assure you that AFM won't be a durbility issue. It is on many of the V8s in the Full Size Truck line up and they are tested for more severe conditions for loading and trailering. Don't be worried about durability.

AFM will give you better fuel economy. Hard to say how much, but should be at least 1 or more. GM did not want this car to have a guzzler penalty so unlike the G8 GXP, you have an AFM motor with the automatic.

The L99 does not have reduced HP during anything close to performance driving. AFM kicks in under light throttle low load conditions. Unlike the trucks, you can actually get in to AFM mode cruising on the highway for long stretches. The trucks have so much aero drag that they will often stay in V8 mode.

The only real drawback I can see is that in AFM mode the engine is running on 4 cylinders. Many of you won't notice it. I am sensitive to it and I can pick it up most of the time. Is it objectionable? To some it may be. To me, well I'd get the LS3 manual.

It isn't invisible, but it isn't obtrusive either. You'll just have to make your own determination.

And I don't know the answer to this, but I'd make damn sure messing with the calibrations didn't void your warranty. Just sayin'..............