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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 xDrive Convertible | Porsche2024 Porsche 718 Spyder RS |
|---|---|---|
| Performance | ||
| Top speedHigher is better | 155 mphManufacturer claim · BMW | 191 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. | 169.5 hp/tCalculated | 350.0 hp/tBestCalculated |
| Lateral accelerationSkidpad radius and surface affect results. | — | 1.05 gIndependent test · Car and Driver |
| Acceleration | ||
| 0–60 mphLower is betterRollout (1ft) handling differs between testers and manufacturers. | 4.60 sManufacturer claim · BMW | 3.20 sBestManufacturer claim · Porsche |
| 0–100 km/hLower is better | 4.90 sManufacturer claim · BMW | 3.40 sBestManufacturer claim · Porsche |
| 0–100 mph | — | 6.60 sIndependent test · Car and Driver |
| 0–200 km/h | — | 10.9 sManufacturer claim · Porsche |
| Quarter-mile elapsed time | — | 10.90 sIndependent test · Car and Driver |
| Quarter-mile trap speed | — | 127.0 mph |
| Braking | ||
| 70–0 mph braking distance | — | 147.0 ftIndependent test · Car and Driver |
| 100–0 mph braking distance | — | 290.0 ftIndependent test · Car and Driver |
| Engine & Powertrain | ||
| Peak powerHigher is better | 335 hpManufacturer claim · BMW | 493 hpBestManufacturer claim · Porsche |
| Peak torqueHigher is better | 368 lb-ftBestManufacturer claim · BMW | 332 lb-ftManufacturer claim · Porsche |
| Engine displacement | 2998.0 ccManufacturer claim · BMW | 3996.0 ccManufacturer claim · Porsche |
| Cylinder count | 6Manufacturer claim · BMW | 6Manufacturer claim · Porsche |
| Engine layout | Inline-6Manufacturer claim · BMW | Flat-6Manufacturer claim · Porsche |
| Engine placement | FrontManufacturer claim · BMW | |
| Dimensions | ||
| Length | 191 inManufacturer claim · BMW | 174 inManufacturer claim · Porsche |
| Width | 75 inManufacturer claim · BMW | 72 inManufacturer claim · Porsche |
| Height | 53 inManufacturer claim · BMW | 49 inManufacturer claim · Porsche |
| Wheelbase | 111 inManufacturer claim · BMW | 98 inManufacturer claim · Porsche |
| Ground clearance | 5 inManufacturer claim · BMW | — |
| Weight | ||
| Curb weightLower is better | 4356 lbManufacturer claim · BMW | 3109 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. | 24.0 mpgBestHomologation · US EPA | 16.0 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 | 14.0 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 | 19.0 mpgHomologation · US EPA |
| Fuel tank capacity | 18.0 galManufacturer claim · BMW | 14.3 galManufacturer claim · Porsche |
| Estimated range (combined)Higher is betterEstimated from tank capacity and quoted combined economy — not an instrumented range. | ||
| Practicality | ||
| Cargo volume | 12 ft³Manufacturer claim · BMW | — |
| Seats | 4Manufacturer claim · BMW | 2Homologation · US EPA |
| Pricing | ||
| Base price (as tested market)Demo prices only; not live FX. | $104,400Homologation · US EPA | $160,700Homologation · US EPA |
| Tires & Wheels | ||
| Front tire size | 245/45R18 A/SManufacturer claim · BMW | 245/35 ZR20Manufacturer claim · Porsche |
| Rear tire size | 275/40R18 A/SManufacturer claim · BMW | 295/30 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.
Community index
Add a value with its source. An editor verifies every submission against its citation before it appears on the site.
| MidManufacturer claim · Porsche |
| Induction type | TurbochargedManufacturer claim · BMW | Naturally aspiratedManufacturer claim · Porsche |
|---|
| Redline | — | 9000Manufacturer claim · Porsche |
|---|
| Transmission type | Torque-converter automaticManufacturer claim · BMW | Dual-clutch (PDK)Manufacturer claim · Porsche |
|---|
| Number of gears | 8Manufacturer claim · BMW | 7Manufacturer claim · Porsche |
|---|
| 432 miBestCalculated |
| 228 miCalculated |
| Estimated range (highway)Higher is betterEstimated from tank capacity and quoted highway economy — not an instrumented range. | 522 miBestCalculated | 271 miCalculated |
|---|
| Estimated range (city)Higher is betterEstimated from tank capacity and quoted city economy — not an instrumented range. | 378 miBestCalculated | 200 miCalculated |
|---|