I know you'll check your pm.
What's great is they are working with you.
What's sad is GM's over-concern for performance enhancements. Running rich can cause many longterm problems. Humm, TB clogging? Cat issues?
The programmers have it easy, just lean out the engine a tad and BAM! $400 please. Instant performance gains and some may argue MPG increases.
Frankly, it's rather irritating.
