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Why don't ford, Chevy, or Dodge use the programming the aftermarket programmers use for better MPG?

I know about the idiot factor when the power is turned way up on a diesel programer but why don't the vehicle manufacters use mild tuning to provide better fuel economy. I had the edge on my 6.0L f250 and gained a few MPG but had to take it off for warranty reasons (in and out of the shop too many times).
I thought the driveability was way better with it on.

actually the pcm programming is mainly done for EPA regulations. the pcm parameters need to be set at a "safe" compromise for power, economy, and durability. could the big 3 chane the injector pulse and spark timing to make it more efficent? sure, but what if that increased pollution? then the EPA will label the vehicle as a gross polluter and prohibit sales. dont even get me started on the state of california...my manufactuer has a fix for an intermittent stall at idle on an 05 vehicle, proved it works, yet cali refuses to allow the reporgram to be used...

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