I think that Elon meant matching the EPA range; the P85D range at steady 65mph may still prove to be higher than P85.
Currently, I tried 15 miles or so of relatively flat road at 65 on cruise. No possible way it could ever get close to the P85(+) currently at that setting, let alone beat it. I was still in the upper 300s Wh/mi with climate off and everything. Dry road. Edit: I also tried this up north, but it was rainy and not necessarily flat, but came up with similar results.
I was wondering if you will be interested to test your P85D against my P85+ following each other along the same route. We can meet at the Delaware supercharger, charge to same level, set tires to the same pressure, etc. We then can drive south along the Rt.95 for approximately 33 miles to the next rest area (Maryland House Rest Area), and back to the Delaware supercharger, cruise control set to 65mph.
I won't be back up that way for a little while, but my fiance has a P85 with 21's (which is less efficient than my P85 with 19s for sure, but not by much, maybe 8% at worst). We're both heading on a highway run of ~50 miles each way not long from now and I'll make it a point to bring both cars. I'll even follow behind her to give the P85D a small drafting handicap. It is almost pointless though because I know the P85D will be less efficient as it stands.
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