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The concept of overtaking a car in an outer lane (undertaking) has regulation that varies greatly between jurisdictions. What is consistent though it that undertaking is generally considered unsafe as drivers do not expect to find cars passing along their outside.
Countries like Germany, France, and Finland specifically prohibit undertaking outside built up areas while in the US, Canada, and the UK the action is discouraged but not specifically prohibited. For as long as my family has owned our 1998 Honda Accord my dad has been recording the fuel use and mileage at every fill-up. Since buying the car in 2000 we have amassed a huge collection of driving data that for the most past has not been put to use.
This data is actually extremely useful when looking at the overall cost of the car, how well it is faring, and whether it is in need of a replacement.