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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 Z4 M40i | Mercedes-Benz2026 Mercedes-AMG SL 63 Roadster |
|---|---|---|
| Performance | ||
| Top speedHigher is better | 155 mphManufacturer claim · BMW | 196 mphBestManufacturer claim · Mercedes-Benz USA |
| 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. | 239.7 hp/tCalculated | 294.4 hp/tBestCalculated |
| 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. | 4.20 sManufacturer claim · BMW | 3.50 sBestManufacturer claim · Mercedes-Benz USA |
| 0–100 km/hLower is better | 4.50 sManufacturer claim · BMW | 3.60 sBestManufacturer claim · Mercedes-Benz USA |
| 0–100 mphLower is better | 8.80 sIndependent test · Car and Driver | 7.10 sBestIndependent test · Car and Driver |
| 0–200 km/h | — | 12.0 sIndependent test · auto motor und sport |
| Braking | ||
| 70–0 mph braking distanceLower is better | 149.0 ftBestIndependent test · Car and Driver | 150.0 ftIndependent test · Car and Driver |
| 100–0 mph braking distanceLower is better | 299.0 ftIndependent test · Car and Driver | 297.0 ftBestIndependent test · Car and Driver |
| Engine & Powertrain | ||
| Peak powerHigher is better | 382 hpManufacturer claim · BMW | 577 hpBestManufacturer claim · Mercedes-Benz USA |
| Peak torqueHigher is better | 369 lb-ftManufacturer claim · BMW | 590 lb-ftBestManufacturer claim · Mercedes-Benz USA |
| Engine displacement | 2998.0 ccManufacturer claim · BMW | 4000.0 ccManufacturer claim · Mercedes-Benz USA |
| Cylinder count | 6Manufacturer claim · BMW | 8Manufacturer claim · Mercedes-Benz USA |
| Engine layout | Inline-6Manufacturer claim · BMW | V8Manufacturer claim · Mercedes-Benz USA |
| Engine placement | FrontManufacturer claim · BMW | |
| Dimensions | ||
| Length | 171 inManufacturer claim · BMW | 185 inManufacturer claim · Mercedes-Benz USA |
| Width | 73 inManufacturer claim · BMW | 75 inManufacturer claim · Mercedes-Benz USA |
| Height | 51 inManufacturer claim · BMW | 54 inManufacturer claim · Mercedes-Benz USA |
| Wheelbase | 97 inManufacturer claim · BMW | 106 inManufacturer claim · Mercedes-Benz USA |
| Ground clearance | 5 inManufacturer claim · BMW | — |
| Weight | ||
| Curb weightLower is better | 3514 lbBestManufacturer claim · BMW | 4321 lbManufacturer claim · Mercedes-Benz USA |
| Fuel Economy | ||
| Fuel economy (combined)Lower L/100km is better; higher mpg is better — direction is on the canonical L/100km. | 25.0 mpgHomologation · US EPA | — |
| Fuel economy (city)Lower L/100km is better; higher mpg is better — direction is on the canonical L/100km. | 23.0 mpgHomologation · US EPA | — |
| Fuel economy (highway)Lower L/100km is better; higher mpg is better — direction is on the canonical L/100km. | 29.0 mpgHomologation · US EPA | — |
| Fuel tank capacity | — | 18.5 galManufacturer claim · Mercedes-Benz USA |
| Practicality | ||
| Cargo volumeHigher is better | 10 ft³BestManufacturer claim · BMW | 7 ft³Manufacturer claim · Mercedes-Benz USA |
| Seats | 2Manufacturer claim · BMW | 4Manufacturer claim · Mercedes-Benz USA |
| Pricing | ||
| Base price (as tested market)Demo prices only; not live FX. | $67,000Homologation · US EPA | $187,850Manufacturer claim · Mercedes-Benz USA |
| Tires & Wheels | ||
| Front tire size | 255/35 R19 96Y XLManufacturer claim · BMW | 265/40R20Manufacturer claim · Mercedes-Benz USA |
| Rear tire size | 285/30 R20 99Y XLManufacturer claim · BMW | 295/35R20Manufacturer claim · Mercedes-Benz USA |
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.
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| Induction type | TurbochargedManufacturer claim · BMW | Twin-turboManufacturer claim · Mercedes-Benz USA |
|---|
| Transmission type | Torque-converter automaticManufacturer claim · BMW | — |
|---|
| Number of gears | 8Manufacturer claim · BMW | 9Manufacturer claim · Mercedes-Benz USA |
|---|