I don't know if this table even exists in the P59 controller, specifically for the 2004 GTO, but it would be worth a shot to ask. In the pictures attached I've circled the table from a 2008 Silverado that I would like to see added. It's under Engine>Spark>Advance in the AFR Correction area. It's called Mult. vs Composition and is what determines how much spark is added based on the alcohol percentage. All this would be in order to convert vehicles with these controllers to Flex Fuel. I've also added a screen shot of a P59 controller in the same area for a comparison. In addition there has been some discussion about this table in this thread http://www.hptuners.com/forum/showth...cohol-settings.
Thanks!