In the US a typical family car covers 120,000 miles over its life and delivers, on average 25 miles per US gallon (6.6 miles per litre). Petrol in the US costs \(\$ 0.63\) per litre, so the life cost for fuel is \(\$ 11,455\). The typical family car, when loaded, weighs \(2315 \mathrm{~kg}\). If the petrol consumption is directly proportional to the weight, what is the value of reducing the weight of the car by \(1 \mathrm{~kg}\)?