Has anyone ever tried any of the performance chips or similar in the LS? I'm more curious about gaining some MPG vs power, etc. I read about Torrie's performance tune on a recent thread here, but that seems to be more about things other than MPG. Places like Lincoln LS Performance Chips - Amazing Lincoln LS Chips have chips for $70 that claim 4-7 more mpg. If there is such a thing in that price range that actually works, I would love to hear about it. If it's all BS like so many other things, then oh well.