Most powerful car with the least g/km?

PMKeates said:
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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cool :)
 
Odd thread - Bhp is pretty irrelevant to the NEDC CO2 figures.

The car never even gets near peak power on the NEDC
 
Simon said:
Odd thread - Bhp is pretty irrelevant to the NEDC CO2 figures.

The car never even gets near peak power on the NEDC
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It's not irrelevent at all.

CO2 tells us:

a) How much tax we pay
b) Approximate fuel economy we can expect when taking it easy.

In a low CO2 but high BHP car, you get to have fun when you play and save money on tax and fuel when you dont, just not at the same time ;)
 
[TW]Fox;16999786 said:
In a low CO2 but high BHP car, you get to have fun when you play and save money on tax and fuel when you dont, just not at the same time ;)
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The ratio as we are calculating it in this thread is irrelevant.

A car could have 60 HP and 25 g/km, a ratio of 2.4, and be far less "good" in the terms you describe than a car with 200 HP and 100 g/km. The former is 20% better in the ratio, yet will be dog slow and will only save you about £600 a year in fuel over 10,000 miles versus the latter.

The two figures are important but the ratio does not provide any reliable insight.
 
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