I have a 2006 Liberty CRD with 100k on it. I have updated the Torque Converter to the Euro model. Decided to tune it with the "Full Torque Eco Tune" prior to a trip from Wisconsin to Florida. Prior to the tune I averaged 24 mpg on trips to my cabin (240 miles) and 19 around town. After the tune I averaged 28.5 mpg on my trip (2500 miles) and 23 in town. Also better throttle response, less turbo lag, and more torque.

On another note, if you are in a cold climate, I'd highly suggest NOT doing the EHB (Elephant Hole Bypass). I blew a front and rear main seal due to ice buildup in the bypass hose.