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Jul 1, 2022 at 11:00 comment added AcePL Just to point out - modern cars are on much leaner mixture, even petrol-powered. Right now modern, Fuel-injected SI engines can near 20:1 ratio (which is higher than early Diesel engines). But that's just a small point, nothing to invalidate the answer, because if the oxygen levels in atmo would to increase, the modern engines would adjust automatically. Though I don't know how well.
Jun 29, 2022 at 10:31 history answered imtaar CC BY-SA 4.0