Quote:
Originally Posted by racprops
The question was do the US made and programed PCMs stop all improvements in MPG?
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No they don't and this site and (most of) its users are a good indication that they don't.
While engine controls can be and were tweaked to get better official test results, they don't stop you from doing better than the official MPG results.
You only have to apply the right methods , i.e. those that actually work.