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Originally Posted by 2000neon
That's interesting, I have always wondered how it is actually done. How is fuel consumption monitored? Is it just a theoretical, calculated number in the influence coefficient, or is it a measured value?
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All the exhaust from a test is captured in bags, so they can measure exactly how much CO2 the vehicle produced in a run, and therefore how much gas.
How Vehicles Are Tested
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For vehicles using carbon-based fuels (e.g., gasoline, diesel, natural gas, etc.), a hose is connected to the tailpipe to collect the engine exhaust during the tests.
The carbon in the exhaust is measured to calculate the amount of fuel burned during the test. This is more accurate than using a fuel gauge.
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