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I asked my Honda dealer about this and he said (and its not the first time I've heard it) that the car needs anything up to 10,000 miles before being fully loosened up and able to see the true fuel economy. How quick that happens, he said, depends on the type of driving done in the early days.
He explained that the best way of driving was to drive conservatively until the engine has warmed up, but once warmed up 'stretching the legs of the car' is the best policy. Driving cautiously with the accellerator would mean the engine doesn't loosen up as quickly and therefore will take longer to realise the best economy.
As I say, not the first time I've been told that although doesn't really tally with the old 'running in' approach.
But perhaps not worth slating the manufacters figures until the car is well over 10k?
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