MPG with Range AFM Disabler on a V6 4.3

[EZE10]

After searching multiple threads trying to decide what brand of new/used truck to buy I landed at a Silverado because of the range device. My goal was to have a light duty truck that gets around 20 MPG. My mechanic buddies said hell no to the Siverado due to AFM problems. No to Nissan because alot of the stuff under the hood needs the cab of the truck removed to access. No to Ford because it's Ford and I just flat out don't care for a Dodge. So I picked up the new V6 which broke my rule of never buying the first year of a new motor. On slightly hilly and curvy county roads in Mid Missouri I got 21.4 mpg average with v4 activated. I am averaging 19.4 with the Range plugged in. It has yet to run my battery down. Longest without a start would be 3 days. The shift points were definitley smoothed out except first to second going up hill and that doesn't happen all the time. Stock tires also. The reason I didn't do the tune is that I didn't want to take a chance on voiding the warranty by making changes to the computer. Truck had 26,000 miles when purchased. If you get the V6 on a flat highway you could probably jump the MPG up to 21 or higher as I have seen this on short trips. Hope this helps.