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Also remember that the "new" direct injection system will also help with fuel economy. The rumor I've heard is that this new system will create more power, therefore GM may opt to reduce the size of the pistons, which will help the fuel economy a little while keeping the 400HP range they are aiming for.
Regarding AFM, I'm not sure how to feel about it yet. I never drive on the highway and live close to work, so it would rarely help me. Personally, I'm for anything that will help at the pump, but not if it will detract from my driving experience in any way. And it's important to note that "cruising" can be considered ANY speed, when the engine is in a higher gear and therefore under less load. So, expect the AFM to be kicking in a lot more often than only on long highway trips. At 45MPH, I'm at 1500RPMs on city streets in fifth gear. Wouldn't that kick on AFM?
But, here are two things to remember:
1) Companies like Diablo and SCT make tuners that will probably (hopefully) allow AFM to be disabled, the same way that Traction Control can be disabled through the computer.
2) The post about the AFM causing someone's truck to sound like it was "missing" could be anything. It may be a very quiet miss that wouldn't be audible with Flowmasters anyway, or it may actually sound nice....perhaps like a loping idle sound, which I think I would like anyway. Especially considering FLowmasters have a weak droning sound when the engine is under light load anyway.
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