Lease Mileage Math: 7,500 vs 10,000 vs 15,000

How mileage moves a lease

Mileage changes exactly one input: the residual. More miles means the bank expects a less valuable car back, so the residual falls and the payment rents more depreciation. In this site's model the adjustment is roughly a point of residual per mileage band — plus one at 7,500 miles, minus about one at 12,000, minus two at 15,000.

Everything below is the standard model — 36 months, 0.0027 money factor, 10% down, 7.25% tax on the payment — with only the mileage allowance moving. Data snapshot: August 2026.

• Porsche Macan. 7,500 mi: $824. 10,000: $842. 12,000: $856. 15,000: $876 a month. The full 7.5k-to-15k spread is $52.

• Porsche 911. 7,500 mi: $2,115. 10,000: $2,162. 12,000: $2,199. 15,000: $2,256. Spread: $141.

• Mercedes-AMG G63. 7,500 mi: $2,460. 10,000: $2,513. 12,000: $2,555. 15,000: $2,618. Spread: $158.

• Lamborghini Urus. 7,500 mi: $3,406. 10,000: $3,476. 12,000: $3,531. 15,000: $3,615. Spread: $209.

• Rolls-Royce Cullinan. 7,500 mi: $5,926. 10,000: $6,041. 12,000: $6,133. 15,000: $6,271. Spread: $345.

Miles bought up front cost cents

Divide the extra term cost by the extra miles and the pre-purchased mile reveals its price. Stepping the Macan from 10,000 to 15,000 miles a year adds $1,258 over the term for 15,000 additional miles — about 8 cents each. The 911's extra miles cost about 23 cents, the G63's 25, the Urus's 33, and the Cullinan's about 55 cents a mile.

The pattern is the point: the per-mile price is the depreciation curve of that specific car, expressed by the pound. A Macan barely notices odometer digits; a Cullinan's used market reads them like a ledger. Whatever the return-fee schedule in your contract says — and luxury contracts routinely price excess miles far above these figures — the up-front mile is the wholesale mile.

Under-buying is the trap on the other side. Dropping to 7,500 miles saves only $18 a month on the Macan and $115 on the Cullinan — the model gives back a single residual point for the promise. Take that discount only when the promise is true: an unused mileage allowance is depreciation you prepaid and never drove.

Excess-mileage fees at turn-in are set by each bank's contract, not by this model — I do not quote figures I cannot verify. What the model shows is the up-front price of the same miles, and it is low.

Reading your own quote with this dial

Ask the desk to print the same deal at two mileage bands and check the spread against the residual move. In this model a 10,000-to-15,000 step costs the 911 $94 a month via two points of residual. If your quote's step is triple that, the desk moved something else — usually the money factor — behind the mileage question.

Mileage is also the honest lever when the payment nearly fits. Trimming a Cullinan from 10,000 to 7,500 saves $115 a month without touching the car, the term, or the down payment — real money for a garage that rotates cars and rarely drives any of them far.

The five inputs still rule: capitalized cost, residual for this exact term and mileage, money factor, term, mileage. The residual only means anything with its mileage attached — a 63% residual at 10,000 miles and a 61% at 15,000 are the same bank telling the same truth two ways.

What the mileage dial does on this desk

I sit with the lease calculator at https://luxemetry.com/lease-calculator and move only miles. Residual is the error signal. In this model, 12,000 miles costs about one residual point against the 10,000-mile baseline, and 15,000 costs about two.

The Macan, 911, and Cullinan examples already on this page are the same dial on three stickers. Unused low-mileage allowance is prepaid depreciation I never drove.

FTC and Regulation M tell me to read mileage and excess charges on the contract. They do not print this site's cents-per-mile table. That table is the calculator under https://luxemetry.com/methodology .