Via the Autotrip there are three different mileage reports that can be created depending on your business needs. The different reports are:
When using a company car, the HMRC recommended rate (Advisory Fuel Rates) remains the same no matter how many miles are driven in one tax year. This rate is based on the fuel type and engine size of your vehicle.
When using your own car for business miles, the HMRC Approved Mileage Allowance Payment (AMAP) rate changes after you have driven 10,000 business miles in one tax year.
If you have a company vehicle and you use a fuel card in you may need to submit your personal mileage to your employer to be deducted from your pay-check.