Remembering to refill a water bottle with (I assume) highly purified water would be viewed by most consumers as a bigger pain than high octane fuel. And the cost savings in fuel would be at least partly offset by the cost of such water, wouldn't it? Why is BMW interested?
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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