Yep, interesting stuff ... thanks.
The concern I have about numbers like that is that they're going to vary wildly when looking at individual use cases, depending on how often a particular vehicle uses its gas engine. A hybrid that's used mostly for commuting may have only minimal tailpipe emissions over its lifespan, while one that gets a lot of roadtrip use will have a much harder time amortizing the environmental cost of its manufacture. Does Subaru (or anyone else) really have the quantitative statistics to know what percentage of a hybrid's real-world operating life is battery only? I'm skeptical that they do.
And of course the environmental cost of electric production varies wildly, too, depending on where you happen to be driving, so someone looking to evaluate their personal environmental impact would have to figure that into account.
The concern I have about numbers like that is that they're going to vary wildly when looking at individual use cases, depending on how often a particular vehicle uses its gas engine. A hybrid that's used mostly for commuting may have only minimal tailpipe emissions over its lifespan, while one that gets a lot of roadtrip use will have a much harder time amortizing the environmental cost of its manufacture. Does Subaru (or anyone else) really have the quantitative statistics to know what percentage of a hybrid's real-world operating life is battery only? I'm skeptical that they do.
And of course the environmental cost of electric production varies wildly, too, depending on where you happen to be driving, so someone looking to evaluate their personal environmental impact would have to figure that into account.