I see articles like this:
http://www.consumerenergycenter.org/...s_premium.html
"The answer, according to experts who study fuel efficiency in detail, is both regular and premium gasoline. And it would be a waste of money to favor premium over regular, especially in these times when gasoline prices are high, according to the experts.
Virtually nothing is gained by filling up with a premium or more expensive grade of fuel than the vehicle manufacturer has recommended, the experts say. And many of the same experts explain that drivers may not lose much performance from their cars by using a lower grade of fuel than recommended by the car manufacturer."
And BMW X6 is on the PREMIUM (Required) list-
http://static.ed.edmunds-media.com/u...red.061713.pdf
I am thinking I am gonna run regular..
Ed