Source: Consumer Reports
quote: No, the EPA doesn't actually do any testing except for rare instances. What they do is come up with the procedure for testing, that all manufacturers are supposed to follow. The automaker then test the car to the EPA procedure and then submits the results to the EPA.
quote: What's the point of having the manufacturers claim fuel usage figures? As if they're not going to lie to make their cars appear more fuel efficient.
quote: but this is how society *should* work.