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EcoTune runs just fine with stock TC and we just finished a 1,900 mile run on I-10 from Tempe, AZ to Tallahassee, FL with 2 adults in a fully loaded 06 CRD towing a fully loaded 5X8 UHaul trailer with zero shudder and a hand calculated GPS corrected mpg right about 21 mpg, varied a bit depending on terrain. With that tune and the GDE TCM tune the tranny only dropped out of 5th about 6-8 times, total, when we hit some rather steep, by I-10 standards, grades. We could clear similar grades without a downshift when we paid attention and ran the speed up a bit above the cruise setting before starting the grade.
In normal operation, not like above, both I and stoutdog have experienced an mpg improvement of 10-20% from the EcoTune. That's hand calculated/GPS corrected and the increase is above whatever mpg your current driving style produces. The TCM tune provides a slight bump in mpg but only in town. The TCM tune's main advantage is lowering shift points to more like pre-F-37 and lockup in lower gears so once you are on the hwy there is no TCM mpg improvement UNLESS you want to run at say 55mph in 5th lockup in which case mpg would likely be fantastic if you can stand the speed.
_________________ Sold to LOST member my 05 Ltd, GDE Stg II turbo + TCM tune, SunCoast TC w. Transgo kit, Steiger window regulators, Samcos, Fumoto valve, 2nd gen filter head with Lub. Spec. bleeder, Hayden clutch & 11 blade fan, inverted spare, P-1 battery, BF Goodrich Long Trail TAs, Etecno1 glow plugs, timing belt at 50K miles/8 yrs
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