A Routemaster - a London bus - weighs 12 tonnes when empty, 18 tonnes with full. It

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A Routemaster - a London bus - weighs 12 tonnes when empty, 18 tonnes with full. It does, on average, 6.6 miles \((11 \mathrm{~km})\) per imperial gallon of diesel, which cost \(£ 5\) per imperial gallon. The bus travels an average of 57,000 km per year and has a life of 20 years. Assuming that the average load factor is \(50 \%\) (meaning that the bus weighs 15 tonnes on average) and that the fuel consumption is directly proportional to the weight, what is the value of weight saving for a Routemaster? 

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