The mileage allowance would simply be the business miles times the rate per mile, so you wouldn't be getting a "years worth of mileage." Each car would be treated separately. The mileage allowance for each car would be the rate per mile times the business mileage you entered for the vehicle. The actual costs would be the depreciation on the vehicle for the portion of the year it was used in the business plus the cost of operation you entered. The suggestion by TurboTax regarding which method to use would be separate for each vehicle.
You need to keep in mind that you can switch from using the mileage allowance to using actual costs in the future, but you can't switch from actual cost in the first year to the mileage allowance later on. So, your decision on which method to use should take into consideration the future anticipated mileage.
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