955 Wh/mi over 15 miles... I've actually had it over 1000 Wh/mi for a 30 mile stretch before!
Here's what I have on my December 2016 Model X P100DL+ with FSD and 22" wheels... now keep in mind I'm driving 150 miles from Phoenix to Flagstaff on this screenshot... in the 150 miles I could never make it without stopping at a supercharger (there are 3 on the way).
In the past month I've switched to the 20s... it's better but I'll have to calculate it out and take some pics while driving. Would never, ever, ever, ever, ever, ever, ever recommend 22" wheels for the Model X. Never! They may look cool from the outside but I'm always inside my car driving and not looking at my wheels. I got a full set of brand new (well 300 miles on them or something) 20" dark grey slipstreams wheels with the new tires for $1200 from someone who switched to 22s when they bought their X.
Going back to Phoenix is another story.... I drive the 150 miles on a full charge (271 miles is full charge for me), and arrive with almost 200 miles of range still. So that 150 mi drive only uses about 71 miles of range.
I'll update everyone on how much this changes with the 20s, and will stay at 80mph the entire drive to be realistic. That route just has two killer ascents.
I'd also like to ask a question... can I base my range off of a calculation like this: If I'm at 250Wh/Mi and have a P100DL does that mean 400 miles of range from full to empty? Or is the 100kw battery just the size of the battery but only 70% of that 100kw available? I'd like to just divide 100 by the Wh/mi x 100 to get my range... ie 100kw / 200wh/mi (for math sake) = 500 miles of range? But maybe it's more like 70kw / 350wh/mi = 200 total miles of range? I'm just really curious.
Wow - let me join the "WALL OF SHAME" for my efficiency!!!
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Here's my total ascent/descent on this route... from the 'bicycle' directions on Google Maps.
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Going 90mph with that ascent? No wonder!