the diesels that use urea limit maximum speed when the tank is empty, correct? i could see that being quite an effective incentive for people to keep the tank full.
but...... everything other than distilled water WILL be used by a lot of people. gasoline, diesel, rainwater, old oil, urine, stale beer, flat soda, etc. how to design a system that will compensate for that, i don't know.
i would also expect quite a few to put in diesel exhaust fluid by accident, if history is anything to be used to anticipate the future.
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