L31MaxExpress

I read your MPG report were you are using the Lean Burn Cruse in a 1997 Express 1500 5.7/4L60E, & 1999 Tahoe I know of the lean burn in the 85 to 90 Camaros with TPI, have not heard of any other PCMs with it. I have a 93 Chevy Van with a 5.7 TBI 4L60E which I was planning on running with a 87 Camaro TPI & PCM. Please tell me all you can on how to get this setting working on your newer trucks.