HMRC have updated the company car advisory fuel rates to be used from 1 September 2019.
The advisory rates apply when employers reimburse employees for the cost of fuel for business travel in their company cars or require employees to repay the cost of fuel used for private travel.
HMRC review the rates quarterly on 1 March, 1 June, 1 September and 1 December and the current rates are published on their website here:
https://www.gov.uk/government/publications/advisory-fuel-rates