Car comparison

Mercedes-Benz B-class (W246) · Facelift 2014 B 250 · Stage 3vsMercedes-Benz B-class (W246) · Facelift 2014 B 250 · Stage 2vsMercedes-Benz B-class (W246) · Facelift 2014 B 250 · Stage 1vsMercedes-Benz B-class (W246) · Facelift 2014 B 250

Compare specs, acceleration, fuel consumption, dimensions, practicality, and estimated running costs side by side.

New comparison

Mercedes-Benz B-class (W246) · Facelift 2014

B 250 (Stage 3)

317 hp1991 ccGasolineAWDDual-clutchTurbochargedHatchback2014-2018

Mercedes-Benz B-class (W246) · Facelift 2014

B 250 (Stage 2)

274 hp1991 ccGasolineAWDDual-clutchTurbochargedHatchback2014-2018

Mercedes-Benz B-class (W246) · Facelift 2014

B 250 (Stage 1)

249 hp1991 ccGasolineAWDDual-clutchTurbochargedHatchback2014-2018

Mercedes-Benz B-class (W246) · Facelift 2014

B 250

211 hp1991 ccGasolineAWDDual-clutchTurbochargedHatchback2014-2018

Comparison overview

Use the estimates as comparison hints and verify exact figures before making decisions.

Mercedes-Benz B-class (W246) Facelift 2014 B 250 (Stage 3) 317 hp

Quickest 0-100 km/h
5.2 s
Fastest top speed
267 km/h
166 mph
Most powerful
317 hp
236 kW
Highest torque
543 Nm
400 lb-ft
Lightest
1,505 kg
3,318 lb
Best power-to-weight
210 hp/t
157 kW/t
4.8 kg/hp
Lowest combined fuel consumption
6.7 L/100 km
35.1 mpg US
42.2 mpg UK
Lowest city consumption
8.4 L/100 km
28.0 mpg US
33.6 mpg UK
Lowest highway consumption
5.7 L/100 km
41.3 mpg US
49.6 mpg UK
Lowest CO2 emissions
156 g/km
Best estimated range
836 km
519 mi
Largest trunk
488 L
Best overall score
74/100
Best performance score
72/100
Best economy score
89/100
Best practicality score
79/100

Specification comparison

Specification comparison
Model	Mercedes-BenzB-class (W246)Facelift 2014B 250 (Stage 3)317 hp	Mercedes-BenzB-class (W246)Facelift 2014B 250 (Stage 2)274 hp	Mercedes-BenzB-class (W246)Facelift 2014B 250 (Stage 1)249 hp	Mercedes-BenzB-class (W246)Facelift 2014B 250211 hp
Power	317hp236kW+106 hp	274hp205kW+63 hp	249hp186kW+38 hp	211hp157kW
Torque	543Nm400lb-ft+193 Nm	473Nm348lb-ft+123 Nm	427Nm315lb-ft+77 Nm	350Nm258lb-ft
Curb weight	1,505kg3,318lb	1,505kg3,318lb	1,505kg3,318lb	1,505kg3,318lb
Gross weight	2,030kg4,475lb	2,030kg4,475lb	2,030kg4,475lb	2,030kg4,475lb
Top speed	267 km/h 166 mph +32 km/h	254 km/h 158 mph +19 km/h	246 km/h 153 mph +11 km/h	235 km/h 146 mph
To 99% top speed	61.1s99% target: 264 km/h / 164 mph-12.7 s Calculated	65.4s99% target: 251 km/h / 156 mph-8.4 s Calculated	68.2s99% target: 244 km/h / 151 mph-5.6 s Calculated	73.8s99% target: 233 km/h / 145 mph Calculated
0-100 km/h	5.2s-1.5 s	5.7s-1.0 s	6.0s-0.7 s	6.7s
0-200 km/h	16.7s-10.5 s Calculated	19.7s-7.4 s Calculated	22.2s-5.0 s Calculated	27.1s Calculated
0-60 mph	5.0s-1.4 s Calculated	5.4s-0.9 s Calculated	5.7s-0.6 s Calculated	6.4s Calculated
Fuel consumption	6.7L/100 km35.1mpg US42.2mpg UK	6.7L/100 km35.1mpg US42.2mpg UK	6.7L/100 km35.1mpg US42.2mpg UK	6.7L/100 km35.1mpg US42.2mpg UK
Fuel consumption city	8.4L/100 km28mpg US33.6mpg UK	8.4L/100 km28mpg US33.6mpg UK	8.4L/100 km28mpg US33.6mpg UK	8.4L/100 km28mpg US33.6mpg UK
Fuel consumption highway	5.7L/100 km41.3mpg US49.6mpg UK	5.7L/100 km41.3mpg US49.6mpg UK	5.7L/100 km41.3mpg US49.6mpg UK	5.7L/100 km41.3mpg US49.6mpg UK
Quarter mile	13.2s-1.5 s Calculated	13.8s-1.0 s Calculated	14.1s-0.6 s Calculated	14.7s Calculated
Power-to-weight	210hp/t157kW/t95hp/1000 lb Calculated	182hp/t136kW/t83hp/1000 lb Calculated	165hp/t123kW/t75hp/1000 lb Calculated	140hp/t105kW/t64hp/1000 lb Calculated
Torque-to-weight	360Nm/t241lb-ft/ton Calculated	314Nm/t210lb-ft/ton Calculated	284Nm/t190lb-ft/ton Calculated	233Nm/t156lb-ft/ton Calculated
Estimated range	836km519mi Calculated	836km519mi Calculated	836km519mi Calculated	836km519mi Calculated
Displacement	1,991cc121cu in	1,991cc121cu in	1,991cc121cu in	1,991cc121cu in
Length	4,393mm173in	4,393mm173in	4,393mm173in	4,393mm173in
Width	1,786mm70in	1,786mm70in	1,786mm70in	1,786mm70in
Height	1,557mm61in	1,557mm61in	1,557mm61in	1,557mm61in
Wheelbase	2,699mm106in	2,699mm106in	2,699mm106in	2,699mm106in
Front track	1,552mm61in	1,552mm61in	1,552mm61in	1,552mm61in
Rear track	1,549mm61in	1,549mm61in	1,549mm61in	1,549mm61in
Ground clearance	98mm4in	98mm4in	98mm4in	98mm4in
Trunk volume	488L	488L	488L	488L
Max trunk volume	1,547L	1,547L	1,547L	1,547L
Doors	5	5	5	5
Seats	5	5	5	5
Fuel tank	56L	56L	56L	56L
CO2 emissions	156g/km	156g/km	156g/km	156g/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 B-class (W246) Facelift 2014 B 250 (Stage 3) 317 hpMercedes-Benz B-class (W246) Facelift 2014 B 250 (Stage 2) 274 hpMercedes-Benz B-class (W246) Facelift 2014 B 250 (Stage 1) 249 hpMercedes-Benz B-class (W246) Facelift 2014 B 250 211 hpPowerTorque

Dyno simulation data table
Vehicle	Peak power RPM	Peak torque RPM	Max engine speed
Mercedes-BenzB-class (W246)Facelift 2014B 250 (Stage 3)317 hp	5,500 rpm	1,200-4,000 rpm	5,750 rpm
Mercedes-BenzB-class (W246)Facelift 2014B 250 (Stage 2)274 hp	5,500 rpm	1,200-4,000 rpm	5,750 rpm
Mercedes-BenzB-class (W246)Facelift 2014B 250 (Stage 1)249 hp	5,500 rpm	1,200-4,000 rpm	5,750 rpm
Mercedes-BenzB-class (W246)Facelift 2014B 250211 hp	5,500 rpm	1,200-4,000 rpm	5,750 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
Metric	Mercedes-BenzB-class (W246)Facelift 2014B 250 (Stage 3)317 hp	Mercedes-BenzB-class (W246)Facelift 2014B 250 (Stage 2)274 hp	Mercedes-BenzB-class (W246)Facelift 2014B 250 (Stage 1)249 hp	Mercedes-BenzB-class (W246)Facelift 2014B 250211 hp
	Acceleration checkpoints
0-60 mph 0-97 km/h	5.0 s	5.4 s	5.7 s	6.4 s
0-100 km/h 0-62 mph	5.2 s	5.7 s	6.0 s	6.7 s
0-200 km/h 0-124 mph	16.7 s	19.7 s	22.2 s	27.1 s
Top speed	267 km/h 166 mph	254 km/h 158 mph	246 km/h 153 mph	235 km/h 146 mph
	Drag race simulation
60 ft 18 m	2.3 s	2.4 s	2.4 s	2.5 s
330 ft 101 m	5.9 s	6.1 s	6.2 s	6.5 s
1/8 mile 201 m	8.7 s	9.1 s	9.3 s	9.7 s
1000 ft 305 m	11.2 s	11.6 s	11.9 s	12.4 s
1/4 mile 402 m	13.2 s	13.8 s	14.1 s	14.7 s
Trap speed 1/4 mile 402 m	179 km/h 111 mph	171 km/h 106 mph	166 km/h 103 mph	158 km/h 98 mph

Power comparison

Bar comparison chart for Power. Higher is better · hp / kW

Chart data table
Vehicle	Value
Mercedes-BenzB-class (W246)Facelift 2014B 250 (Stage 3)317 hp	317 hp 236 kW
Mercedes-BenzB-class (W246)Facelift 2014B 250 (Stage 2)274 hp	274 hp 205 kW
Mercedes-BenzB-class (W246)Facelift 2014B 250 (Stage 1)249 hp	249 hp 186 kW
Mercedes-BenzB-class (W246)Facelift 2014B 250211 hp	211 hp 157 kW

Mercedes-Benz B-class (W246) Facelift 2014 B 250 (Stage 3) 317 hp has 106 hp more than Mercedes-Benz B-class (W246) Facelift 2014 B 250 211 hp.

The biggest power difference is between Mercedes-Benz B-class (W246) Facelift 2014 B 250 211 hp and Mercedes-Benz B-class (W246) Facelift 2014 B 250 (Stage 3) 317 hp: 106 hp (79 kW).

Torque comparison

Bar comparison chart for Torque. Higher is better · Nm / lb-ft

Chart data table
Vehicle	Value
Mercedes-BenzB-class (W246)Facelift 2014B 250 (Stage 3)317 hp	543 Nm 400 lb-ft
Mercedes-BenzB-class (W246)Facelift 2014B 250 (Stage 2)274 hp	473 Nm 348 lb-ft
Mercedes-BenzB-class (W246)Facelift 2014B 250 (Stage 1)249 hp	427 Nm 315 lb-ft
Mercedes-BenzB-class (W246)Facelift 2014B 250211 hp	350 Nm 258 lb-ft

Curb weight comparison

Bar comparison chart for Curb weight. Lower is better · kg / lb

Chart data table
Vehicle	Value
Mercedes-BenzB-class (W246)Facelift 2014B 250 (Stage 3)317 hp	1,505 kg 3,318 lb
Mercedes-BenzB-class (W246)Facelift 2014B 250 (Stage 2)274 hp	1,505 kg 3,318 lb
Mercedes-BenzB-class (W246)Facelift 2014B 250 (Stage 1)249 hp	1,505 kg 3,318 lb
Mercedes-BenzB-class (W246)Facelift 2014B 250211 hp	1,505 kg 3,318 lb

Top speed without limiter comparison

Bar comparison chart for Top speed without limiter. Higher is better · km/h / mph

Chart data table
Vehicle	Value
Mercedes-BenzB-class (W246)Facelift 2014B 250 (Stage 3)317 hp	267 km/h 166 mph
Mercedes-BenzB-class (W246)Facelift 2014B 250 (Stage 2)274 hp	254 km/h 158 mph
Mercedes-BenzB-class (W246)Facelift 2014B 250 (Stage 1)249 hp	246 km/h 153 mph
Mercedes-BenzB-class (W246)Facelift 2014B 250211 hp	235 km/h 146 mph

0-100 km/h comparison

Bar comparison chart for 0-100 km/h. Lower is better · seconds

Chart data table
Vehicle	Value
Mercedes-BenzB-class (W246)Facelift 2014B 250 (Stage 3)317 hp	5.2 s
Mercedes-BenzB-class (W246)Facelift 2014B 250 (Stage 2)274 hp	5.7 s
Mercedes-BenzB-class (W246)Facelift 2014B 250 (Stage 1)249 hp	6.0 s
Mercedes-BenzB-class (W246)Facelift 2014B 250211 hp	6.7 s

The biggest 0-100 km/h difference is between Mercedes-Benz B-class (W246) Facelift 2014 B 250 (Stage 3) 317 hp and Mercedes-Benz B-class (W246) Facelift 2014 B 250 211 hp: 1.5 s.

The closest cars by acceleration are Mercedes-Benz B-class (W246) Facelift 2014 B 250 (Stage 2) 274 hp and Mercedes-Benz B-class (W246) Facelift 2014 B 250 (Stage 1) 249 hp, separated by only 0.3 s.

Fuel consumption comparison

Bar comparison chart for Fuel consumption. Lower is better · L/100 km / mpg US / mpg UK

Chart data table
Vehicle	Value
Mercedes-BenzB-class (W246)Facelift 2014B 250 (Stage 3)317 hp	6.7 L/100 km 35.1 mpg US 42.2 mpg UK
Mercedes-BenzB-class (W246)Facelift 2014B 250 (Stage 2)274 hp	6.7 L/100 km 35.1 mpg US 42.2 mpg UK
Mercedes-BenzB-class (W246)Facelift 2014B 250 (Stage 1)249 hp	6.7 L/100 km 35.1 mpg US 42.2 mpg UK
Mercedes-BenzB-class (W246)Facelift 2014B 250211 hp	6.7 L/100 km 35.1 mpg US 42.2 mpg UK

Power-to-weight comparison

Bar comparison chart for Power-to-weight. Higher is better · hp/t / kW/t

Chart data table
Vehicle	Value
Mercedes-BenzB-class (W246)Facelift 2014B 250 (Stage 3)317 hp	210 hp/t 157 kW/t 4.8 kg/hp
Mercedes-BenzB-class (W246)Facelift 2014B 250 (Stage 2)274 hp	182 hp/t 136 kW/t 5.5 kg/hp
Mercedes-BenzB-class (W246)Facelift 2014B 250 (Stage 1)249 hp	165 hp/t 123 kW/t 6.0 kg/hp
Mercedes-BenzB-class (W246)Facelift 2014B 250211 hp	140 hp/t 105 kW/t 7.1 kg/hp

Estimated range comparison

Bar comparison chart for Estimated range. Higher is better · km / mi

Chart data table
Vehicle	Value
Mercedes-BenzB-class (W246)Facelift 2014B 250 (Stage 3)317 hp	836 km 519 mi
Mercedes-BenzB-class (W246)Facelift 2014B 250 (Stage 2)274 hp	836 km 519 mi
Mercedes-BenzB-class (W246)Facelift 2014B 250 (Stage 1)249 hp	836 km 519 mi
Mercedes-BenzB-class (W246)Facelift 2014B 250211 hp	836 km 519 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
Vehicle	Power	Acceleration	Top speed
Mercedes-BenzB-class (W246)Facelift 2014B 250 (Stage 3)317 hp	317 hp 236 kW	5.2 s	267 km/h 166 mph
Mercedes-BenzB-class (W246)Facelift 2014B 250 (Stage 2)274 hp	274 hp 205 kW	5.7 s	254 km/h 158 mph
Mercedes-BenzB-class (W246)Facelift 2014B 250 (Stage 1)249 hp	249 hp 186 kW	6.0 s	246 km/h 153 mph
Mercedes-BenzB-class (W246)Facelift 2014B 250211 hp	211 hp 157 kW	6.7 s	235 km/h 146 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-BenzB-class (W246)Facelift 2014B 250 (Stage 3)317 hp

Power	317 hp 236 kW
0-100 km/h	5.2 s
Top speed 267 km/h 166 mph

Doors/seats	5 doors 5 seats
Trunk	488 L 17.2 cu ft
Length	4,393 mm 173.0 in
Height	1,557 mm 61.3 in

Mercedes-BenzB-class (W246)Facelift 2014B 250 (Stage 2)274 hp

Power	274 hp 205 kW
0-100 km/h	5.7 s
Top speed 254 km/h 158 mph

Doors/seats	5 doors 5 seats
Trunk	488 L 17.2 cu ft
Length	4,393 mm 173.0 in
Height	1,557 mm 61.3 in

Mercedes-BenzB-class (W246)Facelift 2014B 250 (Stage 1)249 hp

Power	249 hp 186 kW
0-100 km/h	6.0 s
Top speed 246 km/h 153 mph

Doors/seats	5 doors 5 seats
Trunk	488 L 17.2 cu ft
Length	4,393 mm 173.0 in
Height	1,557 mm 61.3 in

Mercedes-BenzB-class (W246)Facelift 2014B 250211 hp

Power	211 hp 157 kW
0-100 km/h	6.7 s
Top speed 235 km/h 146 mph

Doors/seats	5 doors 5 seats
Trunk	488 L 17.2 cu ft
Length	4,393 mm 173.0 in
Height	1,557 mm 61.3 in

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-BenzB-class (W246)Facelift 2014B 250 (Stage 3)317 hp

Power	317 hp 236 kW
0-100 km/h	5.2 s
Top speed 267 km/h 166 mph

6.7 L/100 km

35.1 mpg US

42.2 mpg UK

Mercedes-BenzB-class (W246)Facelift 2014B 250 (Stage 2)274 hp

Power	274 hp 205 kW
0-100 km/h	5.7 s
Top speed 254 km/h 158 mph

6.7 L/100 km

35.1 mpg US

42.2 mpg UK

Mercedes-BenzB-class (W246)Facelift 2014B 250 (Stage 1)249 hp

Power	249 hp 186 kW
0-100 km/h	6.0 s
Top speed 246 km/h 153 mph

6.7 L/100 km

35.1 mpg US

42.2 mpg UK

Mercedes-BenzB-class (W246)Facelift 2014B 250211 hp

Power	211 hp 157 kW
0-100 km/h	6.7 s
Top speed 235 km/h 146 mph

6.7 L/100 km

35.1 mpg US

42.2 mpg UK

Mercedes-Benz B-class (W246) Facelift 2014 B 250 (Stage 3) 317 hp 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.

Acceleration vs fuel consumption data table
Vehicle	Fuel consumption, L/100 km	0-100 km/h, s
Mercedes-BenzB-class (W246)Facelift 2014B 250 (Stage 3)317 hp	6.7 L/100 km 35.1 mpg US 42.2 mpg UK	5.2 s
Mercedes-BenzB-class (W246)Facelift 2014B 250 (Stage 2)274 hp	6.7 L/100 km 35.1 mpg US 42.2 mpg UK	5.7 s
Mercedes-BenzB-class (W246)Facelift 2014B 250 (Stage 1)249 hp	6.7 L/100 km 35.1 mpg US 42.2 mpg UK	6.0 s
Mercedes-BenzB-class (W246)Facelift 2014B 250211 hp	6.7 L/100 km 35.1 mpg US 42.2 mpg UK	6.7 s

Power-to-weight vs fuel consumption

The shaded area favors higher power-to-weight with lower combined fuel consumption.

Power-to-weight vs fuel consumption data table
Vehicle	Power-to-weight, hp/t	Fuel consumption, L/100 km
Mercedes-BenzB-class (W246)Facelift 2014B 250 (Stage 3)317 hp	210 hp/t 157 kW/t 4.8 kg/hp	6.7 L/100 km 35.1 mpg US 42.2 mpg UK
Mercedes-BenzB-class (W246)Facelift 2014B 250 (Stage 2)274 hp	182 hp/t 136 kW/t 5.5 kg/hp	6.7 L/100 km 35.1 mpg US 42.2 mpg UK
Mercedes-BenzB-class (W246)Facelift 2014B 250 (Stage 1)249 hp	165 hp/t 123 kW/t 6.0 kg/hp	6.7 L/100 km 35.1 mpg US 42.2 mpg UK
Mercedes-BenzB-class (W246)Facelift 2014B 250211 hp	140 hp/t 105 kW/t 7.1 kg/hp	6.7 L/100 km 35.1 mpg US 42.2 mpg UK

Detailed score breakdown

Vehicle

Mercedes-BenzB-class (W246)Facelift 2014B 250 (Stage 3)317 hp

Mercedes-BenzB-class (W246)Facelift 2014B 250 (Stage 2)274 hp

Mercedes-BenzB-class (W246)Facelift 2014B 250 (Stage 1)249 hp

Mercedes-BenzB-class (W246)Facelift 2014B 250211 hp

Power

317 hp

236 kW

274 hp

205 kW

249 hp

186 kW

211 hp

157 kW

Torque

543 Nm

400 lb-ft

473 Nm

348 lb-ft

427 Nm

315 lb-ft

350 Nm

258 lb-ft

Acceleration

5.2 s

5.7 s

6.0 s

6.7 s

Top speed

267 km/h

166 mph

254 km/h

158 mph

246 km/h

153 mph

235 km/h

146 mph

Lightness

1,505 kg

3,318 lb

1,505 kg

3,318 lb

1,505 kg

3,318 lb

1,505 kg

3,318 lb

Fuel consumption

6.7 L/100 km

35.1 mpg US

42.2 mpg UK

6.7 L/100 km

35.1 mpg US

42.2 mpg UK

6.7 L/100 km

35.1 mpg US

42.2 mpg UK

6.7 L/100 km

35.1 mpg US

42.2 mpg UK

Practicality

Doors/seats	5 doors 5 seats
Trunk	488 L 17.2 cu ft
Length	4,393 mm 173.0 in
Height	1,557 mm 61.3 in

Doors/seats	5 doors 5 seats
Trunk	488 L 17.2 cu ft
Length	4,393 mm 173.0 in
Height	1,557 mm 61.3 in

Doors/seats	5 doors 5 seats
Trunk	488 L 17.2 cu ft
Length	4,393 mm 173.0 in
Height	1,557 mm 61.3 in

Doors/seats	5 doors 5 seats
Trunk	488 L 17.2 cu ft
Length	4,393 mm 173.0 in
Height	1,557 mm 61.3 in

Range score

836 km

519 mi

836 km

519 mi

836 km

519 mi

836 km

519 mi

CO2 score

156 g/km

Trunk score

488 L

17.2 cu ft

488 L

17.2 cu ft

488 L

17.2 cu ft

488 L

17.2 cu ft

Power-to-weight score

210 hp/t

157 kW/t

4.8 kg/hp

182 hp/t

136 kW/t

5.5 kg/hp

165 hp/t

123 kW/t

6.0 kg/hp

140 hp/t

105 kW/t

7.1 kg/hp

Overall

Fixed score

Fuel cost and annual usage

Estimate running costs from combined consumption, your annual distance, and the fuel price in your local currency.

Average annual distanceDistance unitFuel price in your local currencyPrice unit

Enter the fuel price in your local currency, for example €/L, $/gal, £/L or any other local currency.

LC = Local Currency

Fuel cost and annual usage
Vehicle	Mercedes-Benz B-class (W246) Facelift 2014 B 250 (Stage 3) 317 hp	Mercedes-Benz B-class (W246) Facelift 2014 B 250 (Stage 2) 274 hp	Mercedes-Benz B-class (W246) Facelift 2014 B 250 (Stage 1) 249 hp	Mercedes-Benz B-class (W246) Facelift 2014 B 250 211 hp
Consumption	6.7 L/100 km35.1 mpg US42.2 mpg UK	6.7 L/100 km35.1 mpg US42.2 mpg UK	6.7 L/100 km35.1 mpg US42.2 mpg UK	6.7 L/100 km35.1 mpg US42.2 mpg UK
Cost / 100 km	11.73 LC100 km	11.73 LC100 km	11.73 LC100 km	11.73 LC100 km
Cost / 100 mi	18.87 LC100 mi	18.87 LC100 mi	18.87 LC100 mi	18.87 LC100 mi
Annual fuel used	1,005 L265 US gal221 UK gal	1,005 L265 US gal221 UK gal	1,005 L265 US gal221 UK gal	1,005 L265 US gal221 UK gal
Annual fuel cost	1,759 LC/year	1,759 LC/year	1,759 LC/year	1,759 LC/year