If you are getting CC because you're tired of thinking on long trips, it might be worthwhile. If you're looking at CC to get better mileage, don't bother. Using a few simple techniques (DWL, DWB) you will be able to get better numbers than CC no problem. Take a look at
this thread. If you try out P&G which will be no problem with your manual, you will see numbers that CC can only dream of. Using P&G I averaged over 74 MPGus coming to work today (70 miles) in a 2001 5sp TDI Jetta.
Kirk