Owners argue about it constantly. Either every mile takes money off the car, or it doesn't. So lets analyze the hard data and for that, the cleanest test is a car that sold twice.

So here’s the stats - 518 Porsche 911s sold at online auction twice, with the second sale in the two years to October 2026. Same car, same VIN, same model year, at least two weeks apart, mileage recorded both times.

Race cars, replicas, tributes, outlaw builds and tuner cars are left out. All prices are hammer prices, before buyer's fees, and we use the middle result (the median) so a few wild sales don't skew the picture.

The typical car came back 4.0% higher, about 21 months after it last sold. 6 in 10 sold for more the second time, and 38% sold for less.

Quick Summary: the 911 market went up, and most cars rode it.

But you know me, a quick summary and overall numbers aren’t going to cut it, so lets dig a little deeper.

1. Does your model go up or down?

Typical change in price between the two sales, by generation:

Summary: the air-cooled cars were the clear winners, and the newest generation went nowhere. The model you own moves the price more than anything else here.

2. Do the miles you add hurt? (basically can you drive it and still make a profit)

We split the cars by how far they were driven between the two sales.

Air-cooled cars driven 5,000 miles or more: 21 cars, typical result +19.2%, with 4 in 5 selling for more.

Water-cooled cars driven 5,000 miles or more: 69 cars, typical result +3.4%.

Summary: there is no step down as the odometer climbs. The one exception is water-cooled cars driven 20,000 miles or more, which came back about 15% lower, but that is only a small number of cars. An easier way to see it is below.

3. Does holding on help?

Across all 911s, cars held three years or more between sales gained a median 7.6%. Driven air-cooled cars held that long gained 19.2%.

Summary: time helps, and time in an air-cooled car helps most, even when the owner kept driving it.

4. Does a quick flip pay?

89 cars sold and then came back up for sale within six months, a median 55 days later. The typical result showed no significant difference, with 49% sold for less the second time. 47% sold for more.

Summary: flipping a 911 is a coin flip. The middle car came back at the same price, and since these are hammer prices before fees, the seller usually ended up behind.

The cars that ‘prove’ it:

The driven air-cooled winner. A 1998 Carrera S Coupe 6-Speed sold in March 2021 with 29,855 miles for $130,000. It sold again in March 2025 with 51,000 miles, 21,145 miles later, for $208,000. That is 60% higher after being driven.

The clean one. A 1998 Carrera S Coupe 6-Speed sold in June 2021 with 20,120 miles for $155,000, and again in February 2026 with 26,000 miles for $228,000. That is 47% higher.

The water-cooled winner. A 2010 Carrera S Coupe 6-Speed sold in April 2024 with 34,000 miles for $73,000. It sold again in October 2026 with 43,000 miles for $109,772. That is 9,000 miles added in two and a half years and 50% higher.

The one that dropped. A 2013 Carrera Coupe sold in June 2022 with 72,000 miles for $57,000. It sold again in August 2026 with 109,300 miles for $46,000. That is 37,300 miles added and 19% lower, the clearest case where miles showed up in the price.

What this doesn't say (feels like I’m about to read out one of those pharmaceutical TV ad disclaimers)

Modifications, condition, colour, specification and timing all move a price, and any single car can go against the trend. Interest rates, the wider economy and what happened to be for sale that month matter too.

The cars that were driven more were also held longer, about three years against about one and a half for the barely driven air-cooled ones, so part of their gain is simply time in a rising market.

The air-cooled groups above 10,000 miles are very small, and past 20,000 miles added the water-cooled group is even smaller cars. This describes the middle of the pack across hundreds of resales, not your car.

Overall summary

Pick the right model and hold it, and normal use does not show up as a cost. Air-cooled 911s gained the most, the 992 stood still, the quick flip went nowhere, and only very high mileage on water-cooled cars showed a drop.

The fair reading is not that miles add value. It is that in the 911 market there is no sign that driving yours costs you money, so go drive people!!!

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