Car lease mileage allowances  are always stated as miles per year or annual mileage. For example a lease might allow 10,000 miles per year. Divide by 12 to get 834 miles per month. If the lease is for, say, 39 months, multiply 39 times the monthly mileage allowance of 834 miles to get a total of 32,526 miles for the entire lease term.

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