Mercedes-Benz S-class (W221) · Facelift 2009
S 500 V8
388 hp5461 ccGasolineRWDAutomaticNaturally aspiratedSedan2009-2011
Car comparison
Mercedes-Benz S-class (W221) · Facelift 2009 S 500 V8vsInfiniti FX II 50 V8
Compare specs, acceleration, fuel consumption, dimensions, practicality, and estimated running costs side by side.
New comparisonVS
Infiniti FX II
50 V8
390 hp5026 ccGasolineAWDAutomaticNaturally aspiratedCrossover2008-2012
Comparison overview
Use the estimates as comparison hints and verify exact figures before making decisions.
Best choices
Mercedes-Benz S-class (W221) Facelift 2009 S 500 V8
- Quickest 0-100 km/h5.4 s
- Fastest top speed265 km/h165 mph Unrestricted250 km/h155 mph Restricted
- Highest torque530 Nm391 lb-ft
- Lightest1,880 kg4,145 lb
- Best power-to-weight206 hp/t154 kW/t4.8 kg/hp
- Lowest combined fuel consumption11.2 L/100 km21.0 mpg US25.2 mpg UK
- Lowest city consumption16.7 L/100 km14.1 mpg US16.9 mpg UK
- Lowest highway consumption8.1 L/100 km29.0 mpg US34.9 mpg UK
- Best estimated range804 km499 mi
- Best overall score75/100
- Best performance score73/100
- Best economy score77/100
Infiniti FX II 50 V8
- Most powerful390 hp291 kW
- Largest trunk702 L
- Best practicality score91/100
Specification comparison
| Model | Mercedes-BenzS-class (W221)Facelift 2009S 500 V8 | InfinitiFX II50 V8 |
|---|---|---|
| Power | 388hp289kW | 390hp291kW |
| Torque | 530Nm391lb-ft | 500Nm369lb-ft |
| Curb weight | 1,880kg4,145lb | 2,075kg4,575lb |
| Gross weight | 2,560kg5,644lb | 2,615kg5,765lb |
| Top speed | Unrestricted 265 km/h165 mph Restricted 250 km/h155 mph Calculated | Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph Calculated |
| To 99% top speed | 52.6s99% target: 262 km/h / 163 mph Calculated | 93.3s99% target: 257 km/h / 160 mph Calculated |
| 0-100 km/h | 5.4s | 5.8s |
| 0-200 km/h | 16.0s Calculated | 22.7s Calculated |
| 0-60 mph | 5.2s Calculated | 5.5s Calculated |
| Fuel consumption | 11.2L/100 km21mpg US25.2mpg UK | 13.1L/100 km18mpg US21.6mpg UK |
| Fuel consumption city | 16.7L/100 km14.1mpg US16.9mpg UK | 18.9L/100 km12.4mpg US14.9mpg UK |
| Fuel consumption highway | 8.1L/100 km29mpg US34.9mpg UK | 9.8L/100 km24mpg US28.8mpg UK |
| Quarter mile | 13.3s Calculated | 14.0s Calculated |
| Power-to-weight | 206hp/t154kW/t94hp/1000 lb Calculated | 188hp/t140kW/t85hp/1000 lb Calculated |
| Torque-to-weight | 282Nm/t189lb-ft/ton Calculated | 241Nm/t161lb-ft/ton Calculated |
| Estimated range | 804km499mi Calculated | 687km427mi Calculated |
| Displacement | 5,461cc333cu in | 5,026cc307cu in |
| Length | 5,096mm201in | 4,860mm191in |
| Width | 1,871mm74in | 1,925mm76in |
| Height | 1,479mm58in | 1,680mm66in |
| Wheelbase | 3,035mm119in | 2,885mm114in |
| Front track | 1,600mm63in | 1,635mm64in |
| Rear track | 1,606mm63in | 1,640mm65in |
| Ground clearance | - | 187mm7in |
| Trunk volume | 560L | 702L |
| Max trunk volume | - | 1,756L |
| Doors | 4 | 5 |
| Seats | 5 | 5 |
| Fuel tank | 90L | 90L |
| CO2 emissions | 262g/km | - |
Performance charts
Use the estimates as comparison hints and verify exact figures before making decisions.
Dyno simulation
Estimated stock-style power and torque curves by engine speed.
Mercedes-Benz S-class (W221) Facelift 2009 S 500 V8Infiniti FX II 50 V8PowerTorque
- Mercedes-Benz S-class (W221) Facelift 2009 S 500 V8: Power / Torque
- Infiniti FX II 50 V8: Power / Torque
| Vehicle | Peak power RPM | Peak torque RPM | Max engine speed |
|---|---|---|---|
| Mercedes-BenzS-class (W221)Facelift 2009S 500 V8 | 6,000 rpm | 2,800-4,800 rpm | 6,250 rpm |
| InfinitiFX II50 V8 | 6,500 rpm | 4,400 rpm | 6,800 rpm |
Acceleration curve
Estimated speed over time for selected vehicles.
| Metric | Mercedes-BenzS-class (W221)Facelift 2009S 500 V8 | InfinitiFX II50 V8 |
|---|---|---|
| Acceleration checkpoints | ||
0-60 mph 0-97 km/h | 5.2 s | 5.5 s |
0-100 km/h 0-62 mph | 5.4 s | 5.8 s |
0-200 km/h 0-124 mph | 16.0 s | 22.7 s |
| Top speed | Unrestricted 265 km/h165 mph Restricted 250 km/h155 mph Likely limited | Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph Limited |
| Drag race simulation | ||
60 ft 18 m | 2.5 s | 2.2 s |
330 ft 101 m | 6.1 s | 6.0 s |
1/8 mile 201 m | 8.9 s | 9.1 s |
1000 ft 305 m | 11.3 s | 11.7 s |
1/4 mile 402 m | 13.3 s | 14.0 s |
Trap speed 1/4 mile 402 m | 183 km/h 113 mph | 163 km/h 101 mph |
Power comparison
Bar comparison chart for Power. Higher is better · hp / kW
| Vehicle | Value |
|---|---|
| Mercedes-BenzS-class (W221)Facelift 2009S 500 V8 | 388 hp 289 kW |
| InfinitiFX II50 V8 | 390 hp 291 kW |
Infiniti FX II 50 V8 has 2 hp more than Mercedes-Benz S-class (W221) Facelift 2009 S 500 V8.
The biggest power difference is between Mercedes-Benz S-class (W221) Facelift 2009 S 500 V8 and Infiniti FX II 50 V8: 2 hp (1 kW).
Torque comparison
Bar comparison chart for Torque. Higher is better · Nm / lb-ft
| Vehicle | Value |
|---|---|
| Mercedes-BenzS-class (W221)Facelift 2009S 500 V8 | 530 Nm 391 lb-ft |
| InfinitiFX II50 V8 | 500 Nm 369 lb-ft |
Curb weight comparison
Bar comparison chart for Curb weight. Lower is better · kg / lb
| Vehicle | Value |
|---|---|
| Mercedes-BenzS-class (W221)Facelift 2009S 500 V8 | 1,880 kg 4,145 lb |
| InfinitiFX II50 V8 | 2,075 kg 4,575 lb |
Top speed without limiter comparison
Bar comparison chart for Top speed without limiter. Higher is better · km/h / mph
| Vehicle | Value |
|---|---|
| Mercedes-BenzS-class (W221)Facelift 2009S 500 V8 | Unrestricted 265 km/h165 mph Restricted 250 km/h155 mph |
| InfinitiFX II50 V8 | Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph |
0-100 km/h comparison
Bar comparison chart for 0-100 km/h. Lower is better · seconds
| Vehicle | Value |
|---|---|
| Mercedes-BenzS-class (W221)Facelift 2009S 500 V8 | 5.4 s |
| InfinitiFX II50 V8 | 5.8 s |
Although Infiniti FX II 50 V8 has more power, Mercedes-Benz S-class (W221) Facelift 2009 S 500 V8 is quicker from 0-100 km/h.
The biggest 0-100 km/h difference is between Mercedes-Benz S-class (W221) Facelift 2009 S 500 V8 and Infiniti FX II 50 V8: 0.4 s.
Fuel consumption comparison
Bar comparison chart for Fuel consumption. Lower is better · L/100 km / mpg US / mpg UK
| Vehicle | Value |
|---|---|
| Mercedes-BenzS-class (W221)Facelift 2009S 500 V8 | 11.2 L/100 km 21.0 mpg US 25.2 mpg UK |
| InfinitiFX II50 V8 | 13.1 L/100 km 18.0 mpg US 21.6 mpg UK |
The biggest fuel consumption difference is between Mercedes-Benz S-class (W221) Facelift 2009 S 500 V8 and Infiniti FX II 50 V8: 1.9 L/100 km.
Power-to-weight comparison
Bar comparison chart for Power-to-weight. Higher is better · hp/t / kW/t
| Vehicle | Value |
|---|---|
| Mercedes-BenzS-class (W221)Facelift 2009S 500 V8 | 206 hp/t 154 kW/t 4.8 kg/hp |
| InfinitiFX II50 V8 | 188 hp/t 140 kW/t 5.3 kg/hp |
Estimated range comparison
Bar comparison chart for Estimated range. Higher is better · km / mi
| Vehicle | Value |
|---|---|
| Mercedes-BenzS-class (W221)Facelift 2009S 500 V8 | 804 km 499 mi |
| InfinitiFX II50 V8 | 687 km 427 mi |
Performance spider chart
Radar chart comparing normalized performance and fuel-consumption scores.
| Vehicle | Power | Acceleration | Top speed |
|---|---|---|---|
| Mercedes-BenzS-class (W221)Facelift 2009S 500 V8 | 388 hp 289 kW | 5.4 s | Unrestricted 265 km/h165 mph Restricted 250 km/h155 mph |
| InfinitiFX II50 V8 | 390 hp 291 kW | 5.8 s | Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph |
Most attractive quadrant
Scatter chart with performance score on the X axis and practicality score on the Y axis.
| Vehicle | Performance score | Practicality score | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mercedes-BenzS-class (W221)Facelift 2009S 500 V8 |
|
| ||||||||||||||
| InfinitiFX II50 V8 |
|
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Performance vs fuel economy
Cars closer to the top-right corner combine stronger performance with better fuel economy scores.
| Vehicle | Performance score | Fuel economy score | ||||||
|---|---|---|---|---|---|---|---|---|
| Mercedes-BenzS-class (W221)Facelift 2009S 500 V8 |
| 11.2 L/100 km 21.0 mpg US 25.2 mpg UK | ||||||
| InfinitiFX II50 V8 |
| 13.1 L/100 km 18.0 mpg US 21.6 mpg UK | ||||||
Mercedes-Benz S-class (W221) Facelift 2009 S 500 V8 is closest to the top-right balance target for performance and fuel economy.
Acceleration vs fuel consumption
Cars closer to the lower-left corner offer a better mix of quick acceleration and low fuel consumption.
| Vehicle | Fuel consumption, L/100 km | 0-100 km/h, s |
|---|---|---|
| Mercedes-BenzS-class (W221)Facelift 2009S 500 V8 | 11.2 L/100 km 21.0 mpg US 25.2 mpg UK | 5.4 s |
| InfinitiFX II50 V8 | 13.1 L/100 km 18.0 mpg US 21.6 mpg UK | 5.8 s |
Power-to-weight vs fuel consumption
The shaded area favors higher power-to-weight with lower combined fuel consumption.
| Vehicle | Power-to-weight, hp/t | Fuel consumption, L/100 km |
|---|---|---|
| Mercedes-BenzS-class (W221)Facelift 2009S 500 V8 | 206 hp/t 154 kW/t 4.8 kg/hp | 11.2 L/100 km 21.0 mpg US 25.2 mpg UK |
| InfinitiFX II50 V8 | 188 hp/t 140 kW/t 5.3 kg/hp | 13.1 L/100 km 18.0 mpg US 21.6 mpg UK |
Detailed score breakdown
| Vehicle | Mercedes-BenzS-class (W221)Facelift 2009S 500 V8 | InfinitiFX II50 V8 | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Power | 388 hp 289 kW | 390 hp 291 kW | ||||||||||||||||
| Torque | 530 Nm 391 lb-ft | 500 Nm 369 lb-ft | ||||||||||||||||
| Acceleration | 5.4 s | 5.8 s | ||||||||||||||||
| Top speed | Unrestricted 265 km/h165 mph Restricted 250 km/h155 mph | Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph | ||||||||||||||||
| Lightness | 1,880 kg 4,145 lb | 2,075 kg 4,575 lb | ||||||||||||||||
| Fuel consumption | 11.2 L/100 km 21.0 mpg US 25.2 mpg UK | 13.1 L/100 km 18.0 mpg US 21.6 mpg UK | ||||||||||||||||
| Practicality |
|
| ||||||||||||||||
| Range score | 804 km 499 mi | 687 km 427 mi | ||||||||||||||||
| CO2 score | 262 g/km | - | ||||||||||||||||
| Trunk score | 560 L 19.8 cu ft | 702 L 24.8 cu ft | ||||||||||||||||
| Power-to-weight score | 206 hp/t 154 kW/t 4.8 kg/hp | 188 hp/t 140 kW/t 5.3 kg/hp | ||||||||||||||||
| Overall | Fixed score | Fixed score |
Fuel cost and annual usage
Estimate running costs from combined consumption, your annual distance, and the fuel price in your local currency.
Enter the fuel price in your local currency, for example €/L, $/gal, £/L or any other local currency.
LC = Local Currency
| Vehicle | Mercedes-Benz S-class (W221) Facelift 2009 S 500 V8 | Infiniti FX II 50 V8 |
|---|---|---|
| Consumption | 11.2 L/100 km21 mpg US25.2 mpg UK | 13.1 L/100 km18 mpg US21.6 mpg UK |
| Cost / 100 km | 19.60 LC100 km | 22.93 LC100 km |
| Cost / 100 mi | 31.54 LC100 mi | 36.89 LC100 mi |
| Annual fuel used | 1,680 L444 US gal370 UK gal | 1,965 L519 US gal432 UK gal |
| Annual fuel cost | 2,940 LC/year | 3,439 LC/year |
Head-to-head comparisons
Mercedes-Benz S-class (W221) Facelift 2009 S 500 V8
- Has 30 Nm more
- Is 195 kg lighter
- Is 0.4 s quicker from 0-100 km/h
- Has 5 km/h (3 mph) higher top speed
- Uses 1.9 L/100 km less fuel
- Has 18 hp/t better power-to-weight
- Has 117 km (72 mi) more estimated range
Pros
- Quickest 0-100 km/h in this comparison
- Highest top speed
- Highest torque
- Lightest
- Lowest combined fuel consumption
- Best power-to-weight ratio
- Best estimated range
Cons
- Lowest power
- Smallest trunk
Infiniti FX II 50 V8
- Has 2 hp more
- Has 142 L more trunk volume
Pros
- Most powerful
- Largest trunk
Cons
- Slowest 0-100 km/h
- Highest combined fuel consumption
- Heaviest
- Lowest top speed
Choose cars to compare
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Mercedes-Benz S-class (W221) S 500 V8
Infiniti FX II 50 V8
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