If you have considered the tax implications of running a company car through your business (please see our article 'Company Car vs Private Car'), and have decided to proceed with a company vehicle, there are two levels of benefit in kind depending on the option you choose relating to fuel.
If you pay for private fuel personally and claim business mileage for trips undertaken in your company car, the benefit in kind liability will be lower. In this situation, the mileage allowance that can be claimed will be in accordance with HMRC's Advisory Fuel Rates.
Please see this link to HMRC for guidance in this matter: