Better MPG while decelerating or on idle?

  • Thread starter Thread starter mk1_salami
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mk1_salami

mk1_salami

Hi all,

I've been having a bit of a discussion with a friend about when you get the best MPG from a petrol car. I argued that the best MPG is obtained whilst decelerating (ie - on overrun), while he said you get better MPG while on idle (dipping the clutch) because while on overrun the engine is still using more fuel than on idle.

Who is right and why?
 
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