new hemi mpg in an Abody?

Trojmn said
Want better mileage? play with the fuel trim. Specifically lean cruise. You almost never need or want 14.7:1 AFR.

Adjust the fuel trims for part throttle cruise to be closer to 16-16.5:1 AFR. Leave full rich enabled for WOT. You wont notice the difference between 14:7 and high 15's in closed loop. 16.8 is the max for my 2.0 breeze commuter car which i adjust via wideband programed output to skew the entire fuel map... also works well just not as slick.

That is my Stratus/breeze in the following thread.
http://www.srtforums.com/forums/f87/lean-cruise-mpg-testing-lc-1-a-440796/

5.7 w/MDS waiting to go in the cuda....

In CMR on the Hemi PCM's I've seen it won't let you adjust the closed loop target AFR. If you closed loop it's going to give you 14.7 unless the fuel trims are soo far off it can't. Might be able to make something to fool the linear o2 sensors into thinking it's sub stoic so it will make it lean though. You'd probably want to hook it up to a vacuume switch so you don't get high 15 afr's at near WOT but still closed loop situations.