The data indicates that all vehicles of the specified Mercedes-Benz E-Class Coupe & Cabriolet (2009-13) E250 model are equipped with a 2.1-liter diesel engine. Additionally, 100% of these vehicles use diesel as their primary fuel type. This consistent engine capacity and fuel type suggest a uniform specification across this particular model and registration period, which may be useful for buyers or fleet managers seeking reliable, standardized engine configurations within this group.