Fuel costs calculator Enter the details of how many miles you expect to drive in the next twelve months, along with the price you pay for fuel (less VAT if you are VAT registered) and the MPG of your vehicle. This calculator will then provide you with details of how much you spend on fuel per year. Personal miles driven (per annum): The total personal miles driven per annum. Price paid per litre of fuel (pence): MPG of vehicle: The Miles Per Gallon of the vehicle. Paid for private use: Does your employer pay for private fuel for a company car? Is it a benefit worth having? Find out by ticking the box and completing the additional information below, if it applies to you. Registered on/after 6th April 2020? Tax Rate (%): 20 40 45 Your marginal tax rate Fuel type: Petrol Diesel The type of fuel that the vehicle uses CO2 emissions (gm/km): The CO2 Emissions of the vehicle. Calculate Note: These calculations are only for illustrative purposes and are not a substitute for professional advice.