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Diesel engines are becoming the predominant power behind modern tractors simply because they have the highest thermal efficiency of the internal or external combustion engine, due to their higher than normal compression ratio. Unlike gasoline engines, the diesel engines in tractors use highly compressed hot air to ignite the fuel as opposed to spark plugs. The main objective of the what are known as IR35 legislation is usually to prevent contractors using the tax benefits associated with operating through their very own personal company. This means people working via limited companies would be be subject to the same degrees of tax as 'normal employees', with the appropriate levels of taxes & national insurance.