I'm not sure considering my X5 4.4 wouldn't have got that if it was falling off a cliff with the engine off

Mine averaged 17.9mpg all highway which was very good. Even BMW specs don't have them higher then 19mpg.

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"promote the general welfare, not provide the general welfare"

We the People of the United States, in Order to form a more perfect Union, establish Justice, insure domestic Tranquility, provide for the common defence, promote the general Welfare, and secure the Blessings of Liberty to ourselves and our Posterity, do ordain and establish this Constitution for the United States of America.