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Originally Posted by LEDZEP
My wife drives the E91 much differenly than I drive the E90 and it is evident in our mileage. However, when we swap cars for a day or two the expected result occurs - the E91 gets better mileage and the E90 gets worse mileage.
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This is an excellent point. I drive my vehicle like a bat out of hell and my wife is very easy on her car. I get the efficiency I do because I drive hard. When we swap out for the day, the E90 gets much better mileage because my wife is driving. If I was not always late, I might drive better and get better fuel efficiency.