Mileage is the single most important number on any lease takeover. Get this calculation wrong and you'll owe thousands at lease-end. Get it right and you can confidently judge whether the listing is a good deal.
The math: prorated allowance
Every lease comes with an annual mileage allowance — typically 10,000, 12,000, or 15,000 miles per year. Total allowance over the lease term = annual allowance × years of lease.
To check if a listing is under or over allowance:
- Find the total mileage allowance from the original lease (annual × term in years).
- Find what fraction of the lease has elapsed (months used / total months).
- Multiply: that's the prorated allowed mileage at this point in the lease.
- Compare to the current odometer reading.
Worked example. 36-month lease at 12,000 mi/yr = 36,000 total allowed miles. After 18 months (50% of term), prorated allowance is 18,000 miles. Current odometer reads 24,000 miles. The car is 6,000 miles over the prorated line.
What overages cost
Excess mileage charges run \$0.15–\$0.30 per mile depending on the brand and vehicle class:
- Mainstream brands (Honda, Toyota, Kia, Hyundai, Mazda): typically \$0.15–\$0.20/mile.
- Premium brands (BMW, Mercedes, Audi, Lexus, Volvo): typically \$0.20–\$0.25/mile.
- Exotic / specialty (Porsche, AMG, M-cars): can hit \$0.30+ per mile.
Continuing the example above: 6,000 miles over × \$0.20/mile = \$1,200 you'd owe at lease-end on top of monthly payments.
How to negotiate around it
If a listing is significantly over the prorated allowance:
- Ask for a cash incentive equal to the projected overage. If the car will be 8,000 miles over by lease-end at your driving rate, ask the seller for ~\$1,600 (8,000 × \$0.20) up front.
- Project YOUR usage forward. Even if the car is over today, if YOU drive less than the prorated rate going forward, you can pull it back under by lease-end.
- Account for it in the monthly cost calculation. Spread the projected overage across remaining months and add it to the monthly payment when comparing to alternatives.
The buyout escape valve
If the car is wildly over allowance and the seller won't budge, check the lease's buyout price (residual value). If the residual is below current market value, you can buy the car at lease-end (no mileage penalty), then sell it. Sometimes the math works.
Common questions
Does the bank prorate the overage charge based on when I took over?
No. The bank charges based on the contract's total allowed mileage vs the odometer at turn-in. They don't care that you were only on the lease for the last 12 months.
Can I buy extra miles up front?
Most lease contracts let you pre-purchase additional miles at a discount (typically \$0.10-\$0.15 vs the \$0.20-\$0.30 you'd pay at lease-end). Some banks let the new lessee do this after a transfer. Check the contract terms.
What if the car is under allowance?
You're in a great spot — you can drive more without penalty, and the seller has essentially given you a discount. Under-mileage cars are popular and often command a cash premium from buyers.
Does highway driving "count differently"?
No. The odometer is the odometer. The bank doesn't care if those miles were stop-and-go city or smooth interstate.
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