CAFE Credit - How does it work?

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Not sure if this has been discussed or not but I did a quick search and couldn't find anything.

I read a lot of company x went back or now recommends a thicker oil e.g. from 5W-20 to 5W-30 ...

How does the fleet CAFE credit work? Do they have to reapply/resubmit data with the new viscosity grade and lose some credit or its an honor system and no one cares?
 
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