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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 M850i xDrive Coupe | Porsche2025 Porsche 911 Carrera |
|---|---|---|
| Performance | ||
| Top speedHigher is better | 155 mphManufacturer claim · BMW | 183 mphBestManufacturer claim · Porsche |
| Power-to-weight ratioHigher is betterCalculated from peak power and curb weight — figures quoted against a different weight basis (e.g. dry or DIN) will differ. | 257.5 hp/tBestCalculated | 256.0 hp/tCalculated |
| Lateral accelerationSkidpad radius and surface affect results. | — | 1.07 gIndependent test · Edmunds |
| Acceleration | ||
| 0–60 mphLower is betterRollout (1ft) handling differs between testers and manufacturers. | 3.60 sTieManufacturer claim · BMW | 3.50 sTieIndependent test · Edmunds |
| 0–100 km/hLower is better | 3.70 sBestManufacturer claim · BMW | 4.10 sManufacturer claim · Porsche |
| 0–100 mphLower is better | 7.60 sBestIndependent test · Car and Driver | 7.80 sIndependent test · Car and Driver |
| 0–200 km/hLower is better | 13.2 sBestIndependent test · auto motor und sport | 14.4 sManufacturer claim · Porsche |
| Quarter-mile elapsed time | — | 11.70 sIndependent test · Edmunds |
| Braking | ||
| 60–0 mph braking distance | — | 102.0 ftIndependent test · Edmunds |
| 70–0 mph braking distanceLower is better | 161.0 ftIndependent test · Car and Driver | 138.0 ftBestIndependent test · Car and Driver |
| 100–0 mph braking distance | — | 275.0 ftIndependent test · Car and Driver |
| Engine & Powertrain | ||
| Peak powerHigher is better | 523 hpBestManufacturer claim · BMW | 388 hpManufacturer claim · Porsche |
| Peak torqueHigher is better | 553 lb-ftBestManufacturer claim · BMW | 331 lb-ftManufacturer claim · Porsche |
| Engine displacement | 4395.0 ccManufacturer claim · BMW | 3000.0 ccManufacturer claim · Porsche |
| Cylinder count | 8Manufacturer claim · BMW | 6Manufacturer claim · Porsche |
| Engine layout | V8Manufacturer claim · BMW | Flat-6Manufacturer claim · Porsche |
| Engine placement | FrontManufacturer claim · BMW | |
| Dimensions | ||
| Length | 191 inManufacturer claim · BMW | 179 inManufacturer claim · Porsche |
| Width | 75 inManufacturer claim · BMW | 80 inManufacturer claim · Porsche |
| Height | 53 inManufacturer claim · BMW | 51 inManufacturer claim · Porsche |
| Wheelbase | 111 inManufacturer claim · BMW | 97 inManufacturer claim · Porsche |
| Weight | ||
| Curb weightLower is better | 4478 lbManufacturer claim · BMW | 3342 lbBestManufacturer 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. | 19.0 mpgHomologation · US EPA | 21.0 mpgBestHomologation · US EPA |
| Fuel economy (city)Higher is betterLower L/100km is better; higher mpg is better — direction is on the canonical L/100km. | 17.0 mpgHomologation · US EPA | 18.0 mpgBestHomologation · US EPA |
| Fuel economy (highway)Higher is betterLower L/100km is better; higher mpg is better — direction is on the canonical L/100km. | 24.0 mpgHomologation · US EPA | 25.0 mpgBestHomologation · US EPA |
| Fuel tank capacity | 18.0 galManufacturer claim · BMW | 16.6 galManufacturer claim · Porsche |
| Estimated range (combined)Higher is betterEstimated from tank capacity and quoted combined economy — not an instrumented range. | ||
| Practicality | ||
| Cargo volumeHigher is better | 15 ft³BestManufacturer claim · BMW | 5 ft³Manufacturer claim · Porsche |
| Seats | 4Manufacturer claim · BMW | 4Manufacturer claim · Porsche |
| Pricing | ||
| Base price (as tested market)Demo prices only; not live FX. | $107,300Homologation · US EPA | $120,100Homologation · US EPA |
| Aerodynamics | ||
| Drag coefficient (Cd) | — | 0.30 :1Independent test · CarreraFever |
| Tires & Wheels | ||
| Front tire size | 245/35R20Manufacturer claim · BMW | 235/40 ZR19Manufacturer claim · Porsche |
| Rear tire size | 275/30R20Manufacturer claim · BMW | 295/35 ZR20Manufacturer 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.
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Add a value with its source. An editor verifies every submission against its citation before it appears on the site.
| Quarter-mile trap speed | — | 117.2 mphIndependent test · Edmunds |
|---|
| Induction type | Twin-turboManufacturer claim · BMW | Twin-turboManufacturer claim · Porsche |
|---|
| Redline | — | 7500Manufacturer claim · Porsche |
|---|
| Transmission type | Torque-converter automaticManufacturer claim · BMW | Dual-clutch (PDK)Manufacturer claim · Porsche |
|---|
| Number of gears | 8Manufacturer claim · BMW | 8Manufacturer claim · Porsche |
|---|
| 349 miBestCalculated |
| Estimated range (highway)Higher is betterEstimated from tank capacity and quoted highway economy — not an instrumented range. | 432 miBestCalculated | 415 miCalculated |
|---|
| Estimated range (city)Higher is betterEstimated from tank capacity and quoted city economy — not an instrumented range. | 306 miBestCalculated | 299 miCalculated |
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