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.
225.1 hp/tCalculated
247.4 hp/t✓ BestCalculated
Lateral accelerationSkidpad radius and surface affect results.
1.01 gIndependent test · Car and Driver
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Acceleration
0–60 mphLower is betterRollout (1ft) handling differs between testers and manufacturers.
4.20 sManufacturer claim · Porsche
3.70 s✓ BestManufacturer claim · BMW
0–100 km/hLower is better
4.40 sManufacturer claim · Porsche
3.90 s✓ BestManufacturer claim · BMW
0–100 mphLower is better
9.20 sIndependent test · Car and Driver
8.30 s✓ BestIndependent test · Car and Driver
0–200 km/hLower is better
16.7 sManufacturer claim · Porsche
13.8 s✓ BestManufacturer claim · BMW
Quarter-mile elapsed time
12.80 sManufacturer claim · Porsche
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Braking
70–0 mph braking distanceLower is better
144.0 ft✓ BestIndependent test · Car and Driver
150.0 ftIndependent test · Car and Driver
100–0 mph braking distanceLower is better
294.0 ft✓ BestIndependent test · Car and Driver
300.0 ftIndependent test · Car and Driver
Engine & Powertrain
Peak powerHigher is better
493 hpManufacturer claim · Porsche
617 hp✓ BestManufacturer claim · BMW
Peak torqueHigher is better
486 lb-ftManufacturer claim · Porsche
553 lb-ft✓ BestManufacturer claim · BMW
Engine displacement
4000.0 ccManufacturer claim · Porsche
4395.0 ccManufacturer claim · BMW
Cylinder count
8Manufacturer claim · Porsche
8Manufacturer claim · BMW
Engine layout
V8Manufacturer claim · Porsche
V8Manufacturer claim · BMW
Engine placement
FrontManufacturer claim · Porsche
Dimensions
Length
194 inManufacturer claim · Porsche
195 inManufacturer claim · BMW
Width
78 inManufacturer claim · Porsche
79 inManufacturer claim · BMW
Height
66 inManufacturer claim · Porsche
69 inManufacturer claim · BMW
Wheelbase
114 inManufacturer claim · Porsche
117 inManufacturer claim · BMW
Ground clearance
—
8 inManufacturer claim · BMW
Weight
Curb weightLower is better
4828 lb✓ BestManufacturer claim · Porsche
5498 lbManufacturer claim · BMW
Fuel Economy
Fuel economy (combined)Higher is betterLower L/100km is better; higher mpg is better — direction is on the canonical L/100km.
18.0 mpg✓ BestHomologation · US EPA
15.0 mpgHomologation · US EPA
Fuel economy (city)Higher is betterLower L/100km is better; higher mpg is better — direction is on the canonical L/100km.
15.0 mpg✓ BestHomologation · US EPA
13.0 mpgHomologation · US EPA
Fuel economy (highway)Higher is betterLower L/100km is better; higher mpg is better — direction is on the canonical L/100km.
22.0 mpg✓ BestHomologation · US EPA
18.0 mpgHomologation · US EPA
Fuel tank capacity
23.7 galManufacturer claim · Porsche
21.9 galManufacturer claim · BMW
Estimated range (combined)Higher is betterEstimated from tank capacity and quoted combined economy — not an instrumented range.
Practicality
Cargo volume
—
34 ft³Manufacturer claim · BMW
Seats
5Manufacturer claim · Porsche
5Manufacturer claim · BMW
Pricing
Base price (as tested market)Demo prices only; not live FX.
$124,900Manufacturer claim · Porsche
$127,200Homologation · US EPA
Aerodynamics
Drag coefficient (Cd)
0.34 :1Manufacturer claim · Porsche
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Tires & Wheels
Front tire size
285/45 ZR21Manufacturer claim · Porsche
295/35ZR21 (107Y)Manufacturer claim · BMW
Rear tire size
315/40 ZR21Manufacturer claim · Porsche
315/30ZR22 (107Y)Manufacturer 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.
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