But if Porsche can manufacture/bring a diesel in their SUV, maybe Big "T" will someday for the venerable US-based T4R. This Cayenne looks promising:
2013 Porsche Cayenne Diesel Rated by EPA, Bests Hybrid Sibling on Highway
2013 Porsche Cayenne Diesel: The Jalopnik Review
2013 Porsche Cayenne Diesel Rated by EPA, Bests Hybrid Sibling on Highway
2013 Porsche Cayenne Diesel: The Jalopnik Review