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The Mitsubishi Pajero Owners ClubŪ
The Mitsubishi Pajero, Shogun, Montero, Challenger, Raider and EVO 4x4 Owner's Club
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Simon_W
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Joined: 21 May 2013
Posts: 4881
Location: Watford
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 Posted: Wed Dec 27, 2017 12:53 Post subject: |
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(Sorry everybody, not quite finished yet!) 
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Hi Simon
Fuel economy has nothing to do with emissions, only fuel combustion has a direct relationship.
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Hi Assssin
Fuel economy is a ratio of the distance covered per unit of fuel consumed, and that's what I was using as the basis for comparison. Fuel combustion is the term used for the exothermic chemical reaction between the fuel and oxygen. It's not quantified and isn't a measure of efficiency.
When I referred to 'emissions', I was including CO2 for which there is a linear relationship between emissions (g/km) and fuel economy (mpg). For other emissions, there may be no linear relationship between fuel economy and emissions. However there's a very strong correlation.
Here's an example. Unfortunately I can't find emissions data for my 2.8 Challenger, so have instead taken a 3.2 Shogun of similar vintage to my Mercedes E320CDI.
In real world driving, the Shogun uses 38.2% more fuel and produces 38.2% more CO2 than the Mercedes E320 CDI. It also produces 44.3% more NOx and particulate matter.
Given that my Challenger has older diesel technology than the 3.2 Shogun and gets few miles per gallon, it's certain to produce more than 44% more NOx and PMs than my Mercedes.
Of course I agree with you that weight and aerodynamics make the Shogun much less economical with fuel. They also make it produce more emissions.
Source: http://www.nextgreencar.com/ |
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