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Why is auto insurance ridiculously overpriced for those who drive few miles?
There is plenty of over-rationalisation in the majority of these answers, when the simple answer is that it is simply down to statistics. Say an insurer had two pieces of information about two separate drivers: annual mileage, and whether they had had an accident in the last 3 years. Driver A drives 10,000 miles a year and hasn't had an accident in the past 3 years. Driver B drives 500 miles a year and hasn't had an accident in the past 3 years. Which would the insurer think was the safer bet? The answer is A, and this makes his premiums lower. The reason for this is that the insurer has a lot more data about Driver A than Driver B: they know that Driver A has driven 30,000 miles without having an accident. This could, of course, be luck, or a fluke, but it is likely that Driver A is actually a safe driver. The chance that Driver A hasn't had an accident just through sheer luck and that they are actually a terrible driver is quite slim. On the other hand, Driver B has only driven 1,500 miles in the past three years. Whilst this seems like prima facie evidence of them being as safe a driver as Driver A, it is much more likely that Driver B could have driven 1,500 miles and avoided an accident through sheer luck, even though they are a terrible driver.  This means drivers who drive low amounts of mileage will be penalised relative to other drivers who have high mileage. It has nothing to do with insurers taking a judgement that 'doing more mileage makes you more experienced' or 'makes you a better driver' as others have suggested here (although, it is probably true - it's not quantifiable from an insurer's perspective).