If I understand correctly, the raison d' etre for turbochargers is for meeting government economy standards. I am certainly a sincere advocate of protecting the environment but I still have to believe there has to be some reasonable bang for the buck. I have never seen a comprehensive analysis showing the improvement in economy provided by turbo chargers gives any real improvement with respect to protecting our environment considering everything it takes to engineer, manufacture and install turbochargers in a vehicle including natural resources, transportation costs, energy, emissions, etc. The car is also more complicated mechanically because of turbo support systems like the soak back pump etc. and that also takes some finite hit on the environment. Additionally, the difference in how one drives with a turbo must also be considered as that probably significantly negates a turbo's economy adavantage. My experience with two essentilly identical vehicles, with & without turbos, underscores all these considerations in my mind and makes me believe a turbocharger really provides no consequential increase, if any, in gasoline economy and therefore emissions. I had a 2011 BMW X3 28i with that wonderful in line 6. In 2016 I bought another 28i X3 but it came with a 4 cylinder turbo and an incredibly over engineered 8 speed automatic transmission. Its performance unacceptably and unpleasantly sucks in the default "Comfort" mode and only approaches that of the 2011 in Sport mode. However, I see a zero difference in economy, probably because I always compensate for the pathetic default performance by never ever using Comfort mode and always apply more throttle than needed on the 2011 for the same response. I said all this because it leads to my willingness to pay a reasonable gas-guzzler tax if I could only get a car without a turbo and the incredibly annoying lack of instantaneous gratification to a throttle input. Of course I deeply believe we all must sacrifice to protect our environment but in the case of turbochargers, I just don't believe, when considering everything, they accomplish squat unless one is willing to sacrifice performance and throttle response and that is something I do not think most buyers of Porsches are willing to do.