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Compare
Compare 2–4 cars side by side. Every figure is sourced; the best value in each comparable row is marked.
| Specification | BMW2025 BMW 840i Coupe | Porsche2025 Porsche 718 Cayman S |
|---|---|---|
| Performance | ||
| Top speedHigher is better | 155 mphManufacturer claim · BMW | 177 mphBestManufacturer claim · Porsche |
| Power-to-weight ratioCalculated from peak power and curb weight — figures quoted against a different weight basis (e.g. dry or DIN) will differ. | — | 252.7 hp/tCalculated |
| Lateral accelerationSkidpad radius and surface affect results. | — | 1.04 gIndependent test · Car and Driver |
| Acceleration | ||
| 0–60 mphLower is betterRollout (1ft) handling differs between testers and manufacturers. | 4.70 sManufacturer claim · BMW | 4.20 sBestManufacturer claim · Porsche |
| 0–100 km/hLower is better | 5.30 sIndependent test · Wikipedia | 4.40 sBestIndependent test · Wikipedia |
| 0–100 mph | — | 9.30 sIndependent test · Car and Driver |
| 0–200 km/h | — | 15.0 sManufacturer claim · Porsche |
| Quarter-mile elapsed time | — | 12.60 sManufacturer claim · Porsche |
| Braking | ||
| 70–0 mph braking distance | — | 144.0 ftIndependent test · Car and Driver |
| Engine & Powertrain | ||
| Peak powerHigher is better | 335 hpIndependent test · Wikipedia | 350 hpBestManufacturer claim · Porsche |
| Peak torqueHigher is better | 332 lb-ftBestIndependent test · Wikipedia | 309 lb-ftManufacturer claim · Porsche |
| Engine displacement | 3000.0 ccHomologation · US EPA | 2497.0 ccManufacturer claim · Porsche |
| Cylinder count | 6Homologation · US EPA | 4Manufacturer claim · Porsche |
| Engine layout | Inline-6Independent test · Wikipedia | Flat-4Manufacturer claim · Porsche |
| Engine placement | FrontIndependent test · Wikipedia | |
| Dimensions | ||
| Length | 191 inIndependent test · Wikipedia | 172 inManufacturer claim · Porsche |
| Width | 75 inIndependent test · Wikipedia | 71 inManufacturer claim · Porsche |
| Height | 53 inIndependent test · Wikipedia | 51 inManufacturer claim · Porsche |
| Wheelbase | 111 inIndependent test · Wikipedia | 97 inManufacturer claim · Porsche |
| Weight | ||
| Curb weight | — | 3054 lbManufacturer claim · Porsche |
| Fuel Economy | ||
| Fuel economy (combined)Higher is betterLower L/100km is better; higher mpg is better — direction is on the canonical L/100km. | 24.0 mpgBestHomologation · US EPA | 22.0 mpgHomologation · US EPA |
| Fuel economy (city)Higher is betterLower L/100km is better; higher mpg is better — direction is on the canonical L/100km. | 21.0 mpgBestHomologation · US EPA | 19.0 mpgHomologation · US EPA |
| Fuel economy (highway)Higher is betterLower L/100km is better; higher mpg is better — direction is on the canonical L/100km. | 29.0 mpgBestHomologation · US EPA | 25.0 mpgHomologation · US EPA |
| Fuel tank capacity | 18.0 galHomologation · US EPA | 16.9 galManufacturer claim · Porsche |
| Estimated range (combined)Higher is betterEstimated from tank capacity and quoted combined economy — not an instrumented range. | ||
| Practicality | ||
| Seats | 4Independent test · Wikipedia | 2Homologation · US EPA |
| Pricing | ||
| Base price (as tested market)Demo prices only; not live FX. | $91,700Homologation · US EPA | $84,800Homologation · US EPA |
| Tires & Wheels | ||
| Front tire size | — | 235/40 ZR19Manufacturer claim · Porsche |
| Rear tire size | — | 265/40 ZR19Manufacturer claim · Porsche |
Every figure is the car’s preferred, sourced value. “Best” marks the strongest value in a row, judged on the canonical measurement (so a winner is correct whichever unit system you view). Open a car to see each value’s source, original units, and alternates.
Community index
Add a value with its source. An editor verifies every submission against its citation before it appears on the site.
| Induction type | TurbochargedIndependent test · Wikipedia | TurbochargedManufacturer claim · Porsche |
|---|
| Redline | — | 7500Manufacturer claim · Porsche |
|---|
| Transmission type | Torque-converter automaticHomologation · US EPA | ManualManufacturer claim · Porsche |
|---|
| Number of gears | 8Homologation · US EPA | 6Manufacturer claim · Porsche |
|---|
| 372 miCalculated |
| Estimated range (highway)Higher is betterEstimated from tank capacity and quoted highway economy — not an instrumented range. | 522 miBestCalculated | 423 miCalculated |
|---|
| Estimated range (city)Higher is betterEstimated from tank capacity and quoted city economy — not an instrumented range. | 378 miBestCalculated | 321 miCalculated |
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