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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 sDrive30i | Mercedes-Benz2026 Mercedes-AMG SL 55 Roadster |
|---|---|---|
| Performance | ||
| Top speedHigher is better | 155 mphManufacturer claim · BMW | 183 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. | 171.0 hp/tCalculated | 241.8 hp/tBestCalculated |
| Acceleration | ||
| 0–60 mphLower is betterRollout (1ft) handling differs between testers and manufacturers. | 5.20 sManufacturer claim · BMW | 3.80 sBestManufacturer claim · Mercedes-Benz USA |
| 0–100 km/hLower is better | 5.40 sManufacturer claim · BMW | 3.90 sBestManufacturer claim · Mercedes-Benz USA |
| Engine & Powertrain | ||
| Peak powerHigher is better | 255 hpManufacturer claim · BMW | 469 hpBestManufacturer claim · Mercedes-Benz USA |
| Peak torqueHigher is better | 295 lb-ftManufacturer claim · BMW | 516 lb-ftBestManufacturer claim · Mercedes-Benz USA |
| Engine displacement | 1998.0 ccManufacturer claim · BMW | 4000.0 ccManufacturer claim · Mercedes-Benz USA |
| Cylinder count | 4Manufacturer claim · BMW | 8Manufacturer claim · Mercedes-Benz USA |
| Engine layout | Inline-4Manufacturer 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 | 3287 lbBestManufacturer claim · BMW | 4277 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. | 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 | 13.7 galManufacturer claim · BMW | 18.5 galManufacturer claim · Mercedes-Benz USA |
| 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 | 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. | $54,500Homologation · US EPA | $145,250Manufacturer claim · Mercedes-Benz USA |
| Tires & Wheels | ||
| Front tire size | 225/45R18 95YManufacturer claim · BMW | 265/40R20Manufacturer claim · Mercedes-Benz USA |
| Rear tire size | 255/40R18 99YManufacturer 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.
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Add a value with its source. An editor verifies every submission against its citation before it appears on the site.
| — |
| 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 |
|---|
| 452 miCalculated |
| — |
| Estimated range (city)Estimated from tank capacity and quoted city economy — not an instrumented range. | 343 miCalculated | — |
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