On: GM’s data mining is just the beginning of the in-car advertising blitz

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If you start it with the garage door closed that quickly becomes incredibly dangerous.

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My truck is a diesel with DEF fluid. Surprisingly you can't smell a thing in there when it's been running for 5 minutes.

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The real risk is CO (carbon monoxide) where CO2 makes you breathless and you notice a problem, CO is odorless and inhibits cognitive functions and you really don’t notice anything before death.

PS: DEF only works on NOx compounds.