These guys have been talking all kinds stuff since 2006, and supposedly these cars will go back to carbon for recycling once their service life is over. Supposedly no cars will be sold to the public once they are retired.

I'm guessing its going to be BMW. 3.0L Inline Six with an optional Twin Turbo

http://www.thetruthaboutcars.com/carbon-motors-police-if-not-investors-aware/

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91 350SD
14 F150 Eco
19 Fusion Hybrid
11 GT500