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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 | Porsche2025 Porsche 718 Boxster | BMW2025 BMW 840i Convertible |
|---|---|---|
| Performance | ||
| Top speedHigher is better | 171 mphBestManufacturer claim · Porsche | 155 mphIndependent test · Wikipedia |
| 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. | 219.0 hp/tBestCalculated | 168.3 hp/tCalculated |
| Lateral accelerationSkidpad radius and surface affect results. | 1.01 gIndependent test · Car and Driver | — |
| Acceleration | ||
| 0–60 mphLower is betterRollout (1ft) handling differs between testers and manufacturers. | 4.70 sBestManufacturer claim · Porsche | 5.00 sManufacturer claim · BMW |
| 0–100 km/hLower is better | 4.90 sBestIndependent test · Wikipedia | 5.20 sIndependent test · Wikipedia |
| 0–100 mph | 10.60 sIndependent test · Car and Driver | — |
| 0–200 km/h | 18.1 sManufacturer claim · Porsche | — |
| Quarter-mile elapsed time | 13.20 sManufacturer claim · Porsche | — |
| Braking | ||
| 70–0 mph braking distance | 145.0 ftIndependent test · Car and Driver | — |
| Engine & Powertrain | ||
| Peak powerHigher is better | 300 hpManufacturer claim · Porsche | 335 hpBestIndependent test · Wikipedia |
| Peak torqueHigher is better | 280 lb-ftManufacturer claim · Porsche | 369 lb-ftBestIndependent test · Wikipedia |
| Engine displacement | 1988.0 ccManufacturer claim · Porsche | 3000.0 ccHomologation · US EPA |
| Cylinder count | 4Manufacturer claim · Porsche | 6Homologation · US EPA |
| Engine layout | Flat-4Manufacturer claim · Porsche | Inline-6Independent test · Wikipedia |
| Engine placement | MidManufacturer claim · Porsche | |
| Dimensions | ||
| Length | 172 inIndependent test · Wikipedia | 191 inIndependent test · Wikipedia |
| Width | 71 inIndependent test · Wikipedia | 75 inIndependent test · Wikipedia |
| Height | 50 inIndependent test · Wikipedia | 53 inIndependent test · Wikipedia |
| Wheelbase | 97 inIndependent test · Wikipedia | 111 inIndependent test · Wikipedia |
| Weight | ||
| Curb weightLower is better | 3020 lbBestIndependent test · Wikipedia | 4387 lbIndependent test · Wikipedia |
| 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 mpgTieHomologation · US EPA | 24.0 mpgTieHomologation · 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 mpgTieHomologation · US EPA | 21.0 mpgTieHomologation · US EPA |
| Fuel economy (highway)Higher is betterLower L/100km is better; higher mpg is better — direction is on the canonical L/100km. | 27.0 mpgHomologation · US EPA | 29.0 mpgBestHomologation · US EPA |
| Fuel tank capacity | 14.3 galManufacturer claim · Porsche | 18.0 galHomologation · US EPA |
| Estimated range (combined)Higher is better | ||
| Practicality | ||
| Cargo volume | — | 12 ft³Homologation · US EPA |
| Seats | 2Homologation · US EPA | 4Homologation · US EPA |
| Pricing | ||
| Base price (as tested market)Demo prices only; not live FX. | $74,900Homologation · US EPA | $101,400Homologation · US EPA |
| Tires & Wheels | ||
| Front tire size | 235/45 ZR18Manufacturer claim · Porsche | — |
| Rear tire size | 265/45 ZR18Manufacturer 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 | TurbochargedManufacturer claim · Porsche | TurbochargedHomologation · US EPA |
|---|
| Redline | 7500Manufacturer claim · Porsche | — |
|---|
| Transmission type | ManualManufacturer claim · Porsche | Torque-converter automaticHomologation · US EPA |
|---|
| Number of gears | 6Manufacturer claim · Porsche | 8Homologation · US EPA |
|---|
| 342 miCalculated |
| 432 miBestCalculated |
| Estimated range (highway)Higher is betterEstimated from tank capacity and quoted highway economy — not an instrumented range. | 385 miCalculated | 522 miBestCalculated |
|---|
| Estimated range (city)Higher is betterEstimated from tank capacity and quoted city economy — not an instrumented range. | 300 miCalculated | 378 miBestCalculated |
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