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The 2021 rates take into account 2020 fuel costs. Based on the potential for substantially higher gas prices in 2021, it may be appropriate to consider switching to the actual expense method for 2021 or at least to keep track of the actual expenses, including fuel costs, repairs and maintenance, so that the option is available for 2021.
https://www.coleandgrogan.net/blog/2021-standard-mileage-rates-announced/44861