Show your client the multi-year comparison in thirty seconds.

Mileage rate or actual costs, year by year over the life of the vehicle, with the sale counted. Every assumption is editable.

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UK: Renting or leasing? Actual costs often win. A paid-off older car? Usually the mileage rate.
US: Once the sale is counted, the IRS rate comes out ahead for most drivers.
Canada: In Canada there's one way to claim: your real costs times your work share.
Australia: Over 5,000 work km a year? Cents per km stops counting there, so a 12-week logbook often gives you more.