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I don't know what the book figures for the BMW are... is it 68mpg? If it is then in my experience you would be lucky to see more than 50 on a regular basis unless on a run at sensible speeds and a light right foot.
For planning purposes I would use a figure near 75% of the combined as a starting point.
Remember, an ICE, either petrol or diesel, will return horrible figures until warmed up. Think 10-15mpg for a car with book figures of 45mpg! So, if you are doing a lot of short journeys the saving that are possible with an Ampera are significantly greater than you might imagine by looking at purely at book figures. Book figures are hardly ever achieveable in reality.
For planning purposes I would use a figure near 75% of the combined as a starting point.
Remember, an ICE, either petrol or diesel, will return horrible figures until warmed up. Think 10-15mpg for a car with book figures of 45mpg! So, if you are doing a lot of short journeys the saving that are possible with an Ampera are significantly greater than you might imagine by looking at purely at book figures. Book figures are hardly ever achieveable in reality.