If they could truely give you 1-2mpg, don't you think the OEMs would use them? You can't imagine how many millions they will spend for a few tenths of a MPG.
[quote author=eiching1 link=topic=79421.msg1504849#msg1504849 date=1182436846]
Just like I don't understand why I can buy a tuner to get better performance which would cost them nothing. [/quote]
Tuners don't have to meet emmisions regulations, CAFE fuel economy, nor be guaranteed to run on bad gas, in extreme hot and cold weather and protect the transmission and other driveline components.
It's not like the OEMs don't know the same tricks, they just have a much longer list of requirements that have to be met.
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