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Carmakers, not drivers, are the cause of the problem as obsolete official test results are being manipulated. Then why does this report compare NEDC numbers wi
by andor 11y ago
Carmakers, not drivers, are the cause of the problem as obsolete official test results are being manipulated.
Then why does this report compare NEDC numbers with user-submitted real-world consumption? Since car manufacturers have increased power output while keeping NEDC consumption relatively constant, rather than the other way around, you need to drive very carefully to get close to the official numbers. It should be obvious that the more powerful an engine is, the more fuel it can burn in a period of time, if you go full throttle. Which is why they find that BMW and Mercedes deviate more than the average. Dear "Transport & Environment", why do you think do people buy fast cars?
This is the ICCT report TFA is based on: http://www.theicct.org/sites/default/files/publications/ICCT_LaboratoryToRoad_2015_Report_English.pdf http://www.theicct.org/sites/default/files/publications/ICCT...
- mzs 11y agoThank you for the link. I was hoping it would include more detail about the cars. For example which engines and do they have start-stop. About the only thing I saw mentioned but not well accounted for was the automatic gearbox difference. I have a car with 2.5L turbo engine and I can get from 13.5-28MPG from a tank of gas depending on a number of factors, mainly on how I drive, but also what fuel, how loaded-up the car is, and tires. I suspect that automatics with turbo or supercharged engines with start-stop have the greatest difference in real world v test performance. And yes that is because of how people drive compared to the test.