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Originally Posted by M3Armand
Just as a data point, if I drive my 4.8i X5 in "D", I get a little over 18 mpg in complete highway driving. If I shift myself, I get 20-21 mpg. Admittedly, I shift BEFORE it gets to 2000 rpms. Yes, it somewhat defeats the purpose of getting the V8, but I am liking the fact that I am actually "beating" the advertized mpg. I usually drive 75-80mph on the highway.
Just thought I'd share my mpg experiences.  |
Let me get this right, so if you shift before the engine hits 2000 rpms you save gas? Of course you do, you are accelerating at the speed of a small child. You'd get the same out of "D" if you placed your foot on the pedal as if it were made of glass. 
That advertised mileage is based on average acceleration and speed, not tortoise like acceleration and then simply sitting in overdrive and 6th gear.
But yeah, you probably would get much better gas mileage.
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