I have been directed to page 9 of this :
http://www.iea.org/Textbase/work/200...e/calwell2.pdf
It show % saving against the 3 phases of driving cycle.
A little search gave me this link :
http://www.ataevents.net.au/tmc/spea...sh-Castrol.ppt
Slides 13 to 15 say that the main parameter for lubricant fuel economy is engine load.
As my observations are at idle, this is when the load is the smallest.
Denis.
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