What would cause AFR to be richer with cruise control? Highway cruising, flat road, just holding speed. Without cruise, AFR is stoic. But on cruise control, it is noticably richer. (14.7 vs 13.9 per standalone AEM wideband)

This is a Gen 1 coyote swap in an 07 mustang, engine is stock as pulled from a yard. Running the crate6 control pack strategy. It runs perfect without any issues and gets good fuel economy.

Have not done any logging for this yet, as I'm not sure what to log.

What suggestions you got?