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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 | Mercedes-Benz2026 Mercedes-AMG SL 43 Roadster | BMW2025 BMW Z4 sDrive30i |
|---|---|---|
| Performance | ||
| Top speedHigher is better | 170 mphBestManufacturer claim · Mercedes-Benz USA | 155 mphManufacturer claim · BMW |
| 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. | 239.8 hp/tBestCalculated | 171.0 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. | 4.60 sBestManufacturer claim · Mercedes-Benz USA | 5.20 sManufacturer claim · BMW |
| 0–100 km/hLower is better | 4.70 sBestManufacturer claim · Mercedes-Benz USA | 5.40 sManufacturer claim · BMW |
| 0–100 mph | 11.20 sIndependent test · Car and Driver | — |
| Braking | ||
| 70–0 mph braking distance | 149.0 ftIndependent test · Car and Driver | — |
| 100–0 mph braking distance | 292.0 ftIndependent test · Car and Driver | — |
| Engine & Powertrain | ||
| Peak powerHigher is better | 416 hpBestManufacturer claim · Mercedes-Benz USA | 255 hpManufacturer claim · BMW |
| Peak torqueHigher is better | 369 lb-ftBestManufacturer claim · Mercedes-Benz USA | 295 lb-ftManufacturer claim · BMW |
| Engine displacement | 2000.0 ccManufacturer claim · Mercedes-Benz USA | 1998.0 ccManufacturer claim · BMW |
| Cylinder count | 4Manufacturer claim · Mercedes-Benz USA | 4Manufacturer claim · BMW |
| Engine layout | Inline-4Manufacturer claim · Mercedes-Benz USA | Inline-4Manufacturer claim · BMW |
| Engine placement | — | |
| Dimensions | ||
| Length | 185 inManufacturer claim · Mercedes-Benz USA | 171 inManufacturer claim · BMW |
| Width | 75 inManufacturer claim · Mercedes-Benz USA | 73 inManufacturer claim · BMW |
| Height | 54 inManufacturer claim · Mercedes-Benz USA | 51 inManufacturer claim · BMW |
| Wheelbase | 106 inManufacturer claim · Mercedes-Benz USA | 97 inManufacturer claim · BMW |
| Ground clearance | — | 5 inManufacturer claim · BMW |
| Weight | ||
| Curb weightLower is better | 3825 lbManufacturer claim · Mercedes-Benz USA | 3287 lbBestManufacturer claim · BMW |
| Fuel Economy | ||
| Fuel economy (combined)Lower L/100km is better; higher mpg is better — direction is on the canonical L/100km. | — | 28.0 mpgHomologation · US EPA |
| Fuel economy (city)Lower L/100km is better; higher mpg is better — direction is on the canonical L/100km. | — | 25.0 mpgHomologation · US EPA |
| Fuel economy (highway)Lower L/100km is better; higher mpg is better — direction is on the canonical L/100km. | — | 33.0 mpgHomologation · US EPA |
| Fuel tank capacity | 18.5 galManufacturer claim · Mercedes-Benz USA | 13.7 galManufacturer claim · BMW |
| Estimated range (combined)Estimated from tank capacity and quoted combined economy — not an instrumented range. | — | 384 miCalculated |
| Estimated range (highway)Estimated from tank capacity and quoted highway economy — not an instrumented range. | ||
| Practicality | ||
| Cargo volumeHigher is better | 7 ft³Manufacturer claim · Mercedes-Benz USA | 10 ft³BestManufacturer claim · BMW |
| Seats | 4Manufacturer claim · Mercedes-Benz USA | 2Manufacturer claim · BMW |
| Pricing | ||
| Base price (as tested market)Demo prices only; not live FX. | $112,550Manufacturer claim · Mercedes-Benz USA | $54,500Homologation · US EPA |
| Tires & Wheels | ||
| Front tire size | 255/45R19Manufacturer claim · Mercedes-Benz USA | 225/45R18 95YManufacturer claim · BMW |
| Rear tire size | 285/40R19Manufacturer claim · Mercedes-Benz USA | 255/40R18 99YManufacturer claim · BMW |
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.
| FrontManufacturer claim · BMW |
| Induction type | TurbochargedManufacturer claim · Mercedes-Benz USA | TurbochargedManufacturer claim · BMW |
|---|
| Transmission type | — | Torque-converter automaticManufacturer claim · BMW |
|---|
| Number of gears | 9Manufacturer claim · Mercedes-Benz USA | 8Manufacturer claim · BMW |
|---|
| — |
| 452 miCalculated |
| Estimated range (city)Estimated from tank capacity and quoted city economy — not an instrumented range. | — | 343 miCalculated |
|---|