Most powerful car with the least g/km?

PMKeates said:
It's not a good statistic when you take in to account it's a 2.1 ton S Class, but it's almost completely irrelevant.

Am I the only one who can see that Peak HP per NEDC Combined g/km is about the most rubbish vehicle statistic ever invented?

What does the statistic tell you other than Peak HP per NEDC Combined g/km? It's a statistic for statistics sake, and it tells you nothing. We may as well be finding the car with the most cupholders per width of rear tyre in mm, as it's about as useful.
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I've got 6 cup holders and weedy 195 wide rear tyres, what do I win?
 
Quite impressed with my new E92 320d. Its got all this Efficient Dynamics malarkey & gives an impressive 184 BHP / 125 g/km.

Keeps the tax nice & low & I feel all warm inside as I am quite clearly saving the planet as I stop/start along my journey :p

(Still sounds like a tractor though)
 
Mine car is 1.0 impressive really for such low power, still it's a hybrid so a bit of a cheat for nedc although not as much as pure ev possible hybrids. It's still the lowest carbon car as far as nedc is concerned.
 
Tr1p said:
0.57 here, that will explain the £245 a year road tax I think then. Bloody 179g/km to 103BHP.
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My rover 200 is 170 g/km to 73bhp, yet i pay half of that in tax :D a ratio of .43 for great victory!

But that said its a older car made before anyone cared about c02.
 
Aren't most of these quoting maximum power for bhp and most efficient point for the CO2 figure? How many grammes of CO2 does it get through when it's developing full power? That's a true bhp/g CO2 km surely?
 
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Jonny69 said:
Aren't most of these quoting maximum power for bhp and most efficient point for the CO2 figure? How many grammes of CO2 does it get through when it's developing full power? That's a true bhp/g CO2 km surely?
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THANKYOU. I'm glad I'm not the only one questioning the wisdom of the Peak HP per New European Driving Cycle Combined g/km. An engine that produces 500 HP at peak, yet 150 g/km (3.3 HP per g/km) on the NEDC could be less power-fuel efficient than one that produces 200 HP at peak, yet 145 g/km (1.4 HP per g/km) on the NEDC, as the former at 200 HP could be producing 6000 g/km and the latter 200 HP at 1000 g/km.
 
Is there any sort of way that we may calculate the likely co2 output of a car knowing its real world MPG figure? Fuel consumption is surely directly proportional to the co2 being produced from its combustion?

For example i can achieve 30mpg at 70mph. What is my likely co2/km figure? Ditto i get ~10-12mpg in traffic through London, what is my co2/km in that scenario?

Would be interesting to find a formula?
 
A litre of diesel produces 2620g of CO2, and a litre of petrol produces 2390g of CO2. So, yes, quite easily Jez!

EDIT:

Assuming my calculations are right:

For petrol vehicles: 6752 / Imperial MPG = CO2 g/km
For diesel vehicles: 7402 / Imperial MPG = CO2 g/km

At 30 MPG in your S you are producing 225g/km, and at 10 MPG you are producing 675 g/km.
 
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PMKeates said:
It's not a good statistic when you take in to account it's a 2.1 ton S Class, but it's almost completely irrelevant.

Am I the only one who can see that Peak HP per NEDC Combined g/km is about the most rubbish vehicle statistic ever invented?

What does the statistic tell you other than Peak HP per NEDC Combined g/km? It's a statistic for statistics sake, and it tells you nothing. We may as well be finding the car with the most cupholders per width of rear tyre in mm, as it's about as useful.
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Of course is a rubbish statistic.
 
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