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Posted: **Wed Aug 08, 2012 4:48 am**

What does economy mean (in automation?) I've asked this before and normally I think of MPG or l/100km, but g/kWh? Is this supposed to be fuel economy? Why is it listed as g/kWh then? The options are MPG and l/100km in the options list. It still confuses me.

Posted: **Wed Aug 08, 2012 5:46 am**

Please imagine a long rant about people not (properly) using the search function here. But as this contains a bit of a different drift, I'll answer that part

[g/kWh] is a unit that is directly proportional to the inverse of engine efficiency. It states how many grams of fuel are needed to produce 1 kWh of energy - pretty simple. So the more grams of fuel you need, the less efficient is the engine. As there is a certain energy content per gram of fuel, it basically is efficiency^-1 and could be expressed as a percentage too. For example: 32% engine efficiency.

The rest has been discussed and explained to death here already, so I'm not going to elaborate further.
Cheers!

Posted: **Wed Aug 08, 2012 11:43 am**

Killrob wrote:Please imagine a long rant about people not (properly) using the search function here. But as this contains a bit of a different drift, I'll answer that part

[g/kWh] is a unit that is directly proportional to the inverse of engine efficiency. It states how many grams of fuel are needed to produce 1 kWh of energy - pretty simple. So the more grams of fuel you need, the less efficient is the engine. As there is a certain energy content per gram of fuel, it basically is efficiency^-1 and could be expressed as a percentage too. For example: 32% engine efficiency.

The rest has been discussed and explained to death here already, so I'm not going to elaborate further.
Cheers!

AH, energy efficiency, and that's why engines with newer technologies (such as DI) produce far less g/kwh. I suppose actual fuel economy will be included once the car designer is made.

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