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Hi i'll throw another factor into the equestion. For me travelling over roads that resemble a roller coaster for my daily commute 55-60mph i get better mpg than travelling at 50mph or less. Found this out by accident when following a friend back to my house. Think this is due to carrying momentum up the slopes and free wheeling down slopes. I start to accerate when my speed drops to 40mph. Have gained a 20% improvement in mpg by doing this. Now matching gov mpg figures for cruising at 55mph on level roads.
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