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02142019, 04:59 AM  #1 
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Estimated G80 fuel consumption/CO2 emissions
In some European countries the CO2 emissions are unfortunately a very important factor to take into account when purchasing a new car. To give an example, here in Belgium, the amount of taxes you pay depend on how much the car costs in combination with the CO2 emissions. The CO2 emissions will also be used to determine how much tax deductable the car is when purchased as a company car. It will also be used to determine how much additional tax you pay when registering the car. I have started this thread to see if we can more or less figure out what the expected CO2 emissions are going to be for the upcoming G80 Competition.
I know that this isn't scientifically but I have based myself on the doing the comparison with the X3 M40i, X3 M, G20 M340i to determine what the expected fuel consumption is going to be for the G80 Competition and then convert that to CO2 g/km to get an approximate. X3 M40i (2019) Engine: B58 Power: 354 HP Torque: 500 Nm Fuel consumption: 9.1 l / 100 KM CO2 (combined): 207 g/KM Source: https://www.bmw.be/nl/allmodels/ms...ren.html#tab2 X3 M Competition Engine: S58 Power: 510 HP Torque: 600 Nm Fuel consumption: 10.5 l / 100 KM CO2 (combined): 239 g/KM Source: https://www.bmw.be/nl/allmodels/ms...ren.html#tab0 G20 M340i Engine: B58 Power: 382 HP Torque: 500 Nm Fuel consumption: 7,5 l/100 KM CO2 (combined): 172 g/KM Source: https://www.press.bmwgroup.com/nethe...autoshow2018 From the above it is not immediately clear which formula BMW is using to convert the CO2 (combined) to the fuel consumption in l/100 KM. To give an example according to the NEDCcycle 172 g/KM converts to 7,3 l/100 KM yet on the press release BMW states in the footer that these numbers are according to WLTP and then converted back to NEDC (for the sake of comparibility). Nevertheless when I put the above conversions CO2 (combined) to l/100 KM it seems like the conversions assume a weight somewhere between 2 276 and 2 293 grammes of CO2/liter of petrol. If we then further assume that the S58 consumes more or less 1.4 l/100 KM more than the B58 (according to the numbers of the X3), this would mean that the expected fuel consumption of the G80 (competition) will be 7.5 l/100 KM (M340i) + 1.4 l/100 KM = 8.9 l/100 KM. This would be 0.2 l/100 KM less than the official fuel consumption for the F92. If true this would be crazy considering the bump in power output and torque. If we then convert the hypothetical fuel consumption 8.9 l/100 KM to g/KM this would give a CO2 (combined) of somewhere between 202 and 204 g/KM. The formula is: CO2 g/KM = fuel consumption (l/100 KM) * weight in grammes CO2/liter / 100 Example: CO2 g/KM = 8.9 l/100 KM * 2 273 grammes CO2/liter / 100 CO2 g/KM = 202 g/KM G80 (Competition) Engine: S58 Power: 510 HP Torque: 600 Nm Fuel consumption: 8.9 l/100 KM CO2 (combined): 203 g/KM This means that for people living in Belgium and to be more specific Flanders, and assuming that you buy the G80 competition as a company car for approximately 110 000 euro including 21% VAT TAX you would pay these amounts: BIV (registration fee) = 3 398 euro VB (yearly tax) = 897.09 euro / year VAA* (gross) = 1 186,43 euro / month *The VAA is a tax we pay as the company owner or employee when driving a company car which is based on some complex formula that takes into account the CO2 emissions, the price of the car (not taking into account discounts), the actual VAT you paid, the car's age, ... . According to our Belgian government this is the advantage you get because you don't have to pay for the car yourself but instead you pay a monthly tax. This means that your net salary will be lower and to know how much lower it is approximately the VAA (gross) divided by two. In this case your net salary would be 593 euro lower (1 186,43 euro / 2) Last edited by G4BR13L; 02142019 at 06:52 AM.. 
02142019, 07:52 PM  #2 
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02152019, 12:22 AM  #3  
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The g20 330i was rated at 5.8 L / 100KM, and ended up getting 26/36 EPA rating. So i guess that would be 65% as good on fuel. which is about 17/24. I think thats what the F80 got also. Still not bad considering you're getting extra hp with same mpg 

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02152019, 10:09 AM  #4 
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When I look at the page of the Mercedes C43 AMG they state a fuel consumption of 9.3  9.1 l/100 KM which corresponds to a combined CO2 emissions of 213  209 g/KM.
This means that they have also taken into account a weight of more or less 2 293 grammes of CO2/liter of petrol. In my first post I mentioned that when comparing the different models it seems that BMW uses a weight of somewhere between 2 273 and 2 293 grammes of CO2/liter of petrol. If we assume that the actual formula should take into account a weight of 2 293 grammes CO2/liter of petrol and under the assumption that the G80 will actually have a fuel consumption of 8.9 l/100 KM this means that the CO2 emissions will be closer to 204 g/KM. Formula 8.9 l/100 KM * 2 293 / 100 = 204.077 g/KM One thing is clear: the G80 will be an amazing car Last edited by G4BR13L; 02152019 at 02:20 PM.. 
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