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About: Fuel consumption: ~9.4 L/100 km (25 mpg U.S.).[citation needed]
CO2 emission is directly proportional to fuel consumption. Each litre of petrol/gasoline produces ~2.4 kg of CO2 (for diesel fuel it is ~2.6 kg, mainly because diesel is denser than gasoline).
So, if Lotus claims a CO2 emission of 225 g/km, that is equivalent to 225g * 100 = 22.5 kg / 100 km. Since 22.5 / 2.4 = 22.5 / 2.4 = 9.375 l / 100 km. Or more simply, 225 / 24 = 9.375 l / 100 km.
If you check manufacturers specs for a number of cars, you will see that this relation holds for CO2 emissions versus fuel consumption for combined cycle (accounting for rounding). (I suppose there is a European standard somewhere that specifies that this the way the CO2 emissions are calculated.)
Example (2 Mitsubishis, just because it was the page I had open):
Combined mode lts/100km (mpg) 10.3 8.0 CO2 emissions g/km 246 191 CO2 g/km / lts/100km 23.88 23.875
(Note that in the result only 3 digits are significant.
It is also possible to get (approximately) the same figure starting with the fuel density (0.71–0.77 g/cm^3 for gasoline) (to get the weight of a litre of fuel, 0.71–0.77 kg), making the simplifying assumption that the gasoline is C8H18 ( molecular weight = 114), calculating how many moles of C8H18 there are in that litre of gasoline (call that X = 770 g / 114 g = 6.754) and calculating that the complete combustion of those moles of C8H18 will produce 8 * X = 54.035 as many moles of CO2 which will weight 8 * X * 44 g = 2377.54 g = 2.377 kg.
For diesel the calculation is analogous, using the knowledge that "the average chemical formula for common diesel fuel is C12H23"(167g) and the density is 0.85 kg/l: 850 g / 167 g = 5.089, 12 * 5.089 = 61.077 moles of CO2, 2687.425 g CO2.
I had done such calculations a couple years ago and IIRC the figure I got was also approximately 2.4 kg CO2 produced for each litre of gasoline and 2.6 for diesel.
Rps (
talk)
17:27, 23 July 2008 (UTC)
Official fuel consumption and CO2 emmisions have yet to be release and so any figures seen beforehand should be taken as a guide, at best.
86.29.165.193 (
talk)
16:41, 5 September 2008 (UTC)
I`d love to read some detailed info about the transmission. Is it a Toyota-product too, which type is used? —Preceding unsigned comment added by 87.123.154.144 ( talk) 09:11, 8 June 2010 (UTC)