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The world population is 6.5 billion at the moment and rising. Climate change has caused widespread greenhouse effects like global warming, higher acid levels in oceans, and reduced ice cover at the poles (Harrabin, 2013). The major causes of the greenhouse effect are the by-products of industrialization, and especially carbon dioxide (Samimi & Zarinabadi, 2011). The level of carbon dioxide, the main constituent of emissions by vehicles, is linked to the consumption of fuel by the vehicle. Due to this, there is a need to regulate the number of greenhouse gases that are emitted into the atmosphere and this is effective by fuel economy.