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How is Avg Fuel Consumption Calculated ?
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heine
 


Member Since: 07 Feb 2007
Location: Midrand
Posts: 4054

South Africa 2009 Discovery 3 4.4 V8 HSE Auto Alaska WhiteDiscovery 3
How is Avg Fuel Consumption Calculated ?

I noticed today that fuel from my auxillary tank spills over into the main tank before I actually pump it over . How will this effect the fuel consumption calculation , because this means that the main tank appears to contain 115 l instead of 87 .
  
Post #2128907th Oct 2007 8:37 pm
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buzz
 


Member Since: 19 May 2006
Location: lancashire
Posts: 585

England 

i seem to remember that most systems work out average mpg by taking a measurement of the vacuum in the inlet manifold (bmw's analogue needle is a good example). i assume that the d3 uses this figure along with average speed readings to get the mpg. i think the only difference to you will be in the range figure because as you say the car will think it has the 85l tank however this will change as you pump the fuel over.

i stand to be corrected when someone technical comes along Rolling Eyes
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Post #2131458th Oct 2007 4:34 pm
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heine
 


Member Since: 07 Feb 2007
Location: Midrand
Posts: 4054

South Africa 2009 Discovery 3 4.4 V8 HSE Auto Alaska WhiteDiscovery 3

The reason I'm asking is that the avg consumtion is very optimistic compared to the actual , and I thought this might be because of the extra fuel that flows into the tank
  
Post #2132118th Oct 2007 7:14 pm
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PSC
 


Member Since: 01 May 2006
Location: Johannesburg
Posts: 255

South Africa 2010 Discovery 4 5.0 V8 HSE Auto Fuji WhiteDiscovery 4

I would suspect that LR uses the amount of fuel injected (a known quantity) to calculate the fuel consumption. I doubt that it would use fuel level in the tank to calculate anything other than range. When refueling the range changes but the avg consumption does not.
  
Post #2133249th Oct 2007 5:59 am
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heine
 


Member Since: 07 Feb 2007
Location: Midrand
Posts: 4054

South Africa 2009 Discovery 3 4.4 V8 HSE Auto Alaska WhiteDiscovery 3

Valid point - so the avg calculation just sux then Rolling Eyes
  
Post #2133349th Oct 2007 7:28 am
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