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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 M850i xDrive Coupe | Mercedes-Benz2026 Mercedes-AMG GT 55 Coupe |
|---|---|---|
| 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. | 257.5 hp/tBestCalculated | 238.1 hp/tCalculated |
| Acceleration | ||
| 0–60 mphLower is betterRollout (1ft) handling differs between testers and manufacturers. | 3.60 sBestManufacturer claim · BMW | 3.80 sManufacturer claim · Mercedes-Benz USA |
| 0–100 km/hLower is better | 3.70 sBestManufacturer claim · BMW | 3.90 sManufacturer claim · Mercedes-Benz USA |
| 0–100 mph | 7.60 sIndependent test · Car and Driver | — |
| 0–200 km/h | 13.2 sIndependent test · auto motor und sport | — |
| Braking | ||
| 70–0 mph braking distance | 161.0 ftIndependent test · Car and Driver | — |
| Engine & Powertrain | ||
| Peak powerHigher is better | 523 hpBestManufacturer claim · BMW | 469 hpManufacturer claim · Mercedes-Benz USA |
| Peak torqueHigher is better | 553 lb-ftBestManufacturer claim · BMW | 516 lb-ftManufacturer claim · Mercedes-Benz USA |
| Engine displacement | 4395.0 ccManufacturer claim · BMW | 4000.0 ccManufacturer claim · Mercedes-Benz USA |
| Cylinder count | 8Manufacturer claim · BMW | 8Manufacturer claim · Mercedes-Benz USA |
| Engine layout | V8Manufacturer claim · BMW | V8Manufacturer claim · Mercedes-Benz USA |
| Engine placement | Front | |
| Dimensions | ||
| Length | 191 inManufacturer claim · BMW | 186 inManufacturer claim · Mercedes-Benz USA |
| Width | 75 inManufacturer claim · BMW | 78 inManufacturer claim · Mercedes-Benz USA |
| Height | 53 inManufacturer claim · BMW | 53 inManufacturer claim · Mercedes-Benz USA |
| Wheelbase | 111 inManufacturer claim · BMW | 106 inManufacturer claim · Mercedes-Benz USA |
| Weight | ||
| Curb weightLower is better | 4478 lbManufacturer claim · BMW | 4343 lbBestManufacturer 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. | 19.0 mpgHomologation · US EPA | — |
| Fuel economy (city)Lower L/100km is better; higher mpg is better — direction is on the canonical L/100km. | 17.0 mpgHomologation · US EPA | — |
| Fuel economy (highway)Lower L/100km is better; higher mpg is better — direction is on the canonical L/100km. | 24.0 mpgHomologation · US EPA | — |
| Fuel tank capacity | 18.0 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. | 342 miCalculated | — |
| Estimated range (highway)Estimated from tank capacity and quoted highway economy — not an instrumented range. | ||
| Practicality | ||
| Cargo volumeHigher is better | 15 ft³BestManufacturer claim · BMW | 11 ft³Manufacturer claim · Mercedes-Benz USA |
| Seats | 4Manufacturer claim · BMW | 2Manufacturer claim · Mercedes-Benz USA |
| Pricing | ||
| Base price (as tested market)Demo prices only; not live FX. | $107,300Homologation · US EPA | $138,150Manufacturer claim · Mercedes-Benz USA |
| Tires & Wheels | ||
| Front tire size | 245/35R20Manufacturer claim · BMW | 295/30R20Manufacturer claim · Mercedes-Benz USA |
| Rear tire size | 275/30R20Manufacturer claim · BMW | 305/30R20Manufacturer 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 | Twin-turboManufacturer 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 |
|---|
| 432 miCalculated |
| — |
| Estimated range (city)Estimated from tank capacity and quoted city economy — not an instrumented range. | 306 miCalculated | — |
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