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low MPG

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I have just bought a 2008 ALphard 3litre and have calculated the fuel consumption to be 15.5 mpg.


Is there any advise as to what could be causing the low reading .  I took to a garage who changed the spark plugs and tested the emissions and  which are in the acceptable ranges.


Ian C



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Thanks for the replies.  I have been using Regular fuel and  definitely in D not 4  gear setting.     I have had it in to a garage who have put in new spark plugs and done a road test attached to the ECU which has reported that the consumption is averaging 24.8 mpg????  The other tests done on the engine have readings in the spec ranges , so I am told.  No issues have been flagged from all this testing.   

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