I had it turned off using a Black Bear tune on my 2011 Silverado. That also made it require premium gas or E85 (which was readily available in Michigan). Truck was a beast with that tune. The AFM was annoying and worse is the terrible, laggy throttle and sloppy shifts that GM allowed. The tune fixed all that. When I went to trade it (the first time it was flashed back to stock), it seemed like something was broken.

I just sold my '09 GMC Sierra and it had pretty bad oil consumption from the AFM. At least that's the only factor I could attribute it to.

I was using about 1 quart every 2000 miles or so. I looked into an ODB2 module that turned off the AFM, and could be removed when taken to the dealer with no record of the change apparent. I never pursued it as the truck was already at 150k miles.

My brother had sent me a link to it. I'll see if I still have it.

I think this is it.

https://rangetechnology.com/