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This system would probably be great for high-end BMW owners (not the regular ones, just the really rich ones buying $100k models), who can be counted on to get

This system would probably be great for high-end BMW owners (not the regular ones, just the really rich ones buying $100k models), who can be counted on to get their car serviced at the dealership very frequently. For regular Americans, it'd be a disaster. The tanks would run out and the engines would fall back to their "limping" mode (the safe mode that doesn't need water injection), which would likely have even worse fuel economy than if they had just stuck with regular gas-powered engines without water injection. This would cause the fleet fuel economy to fall greatly. EVs can't come fast enough. At least almost every American seems to be able to handle plugging in their phone regularly and keeping it charged up.

gambiting 10y ago
Actually, if you watch the review of the M4, they very directly say that in case the water runs out the engine performs exactly as the same, non water-boosted engine. So this whole sentence about water-boosted engines that are worse than non-water boosted ones when without water is garbage. And evs are still not a solution for everyone. There doesn't seem to be any good idea on how to own and charge one if you live in an apartment with a shared parking lot or if you have to park on the street. You say that water-boosting will work great for people who buy $100k cars, but at the moment, it looks like EVs are only usable for people who can afford a house with a driveway.