I guess the website is just a little unclear and is therefore misleading. The drop down box on the right states:
MSRP* Starting At: $27,040
As shown: $42,235
- Current Incentives
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More on Model Shown
2008 Dodge Ram 2500 Power Wagon®
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- Build My Own
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* Standard HEMI® V8 engine with 345 hp, or available Cummins®782 Turbo diesel for even more power
* Up to 15,650-lb towing capacity
*The most capable off-road full-size pickup. [1]
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Full Specs & Upgrades
Apparently the mention of engine options applies to all 2008 models, not the Power Wagon. Then when I clicked on the "Full Specs & Upgrades" link, and then the "Options and Upgrades" tab, I didn't realize I was routed to the base model, rather than the Power Wagon, which showed the CTD as an option. So, a confusing set of weblinks and pages caused me to misread it, sorry.