i put 93 over 91 octane as it lasts longer.
And i find the cold weather to have a toll on mpg. seems to be a gas guzler. without warming up the car (idling puts wear on the engine) and tapping the acceleration. very slow keeping it at low rpms.

but when im in a hurry and driving like a F1 driver or the sterotypical BMW owner. I see the gauge go down really fast! like around 30 mile and 1/4 tank is gone!

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2009 BMW E60 LCI 528Xi


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2002 BMW X5 3.0i E53