HP 5000ps - Gray/Magenta Issue

I don't use any software rips, but use the internal print driver. I always have an issue printing grays because it seems to bring in some magenta. I've spoken to quite a few people who have mentioned that HP 5000s combine other colors when printing grays in order to preserve black ink. Anyone know if this is true?
 

Bly

Very Active Member
Most printers use 3 colours till the grey gets dark enough to start adding black ink.
 
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