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Pleasant Range/DegradationSurprise -- Summer Rally


Supporting Member
Supporting Member
Jul 9, 2015
Sherman Oaks, CA
Last spring, as my 85D turned one year old, I was slightly disappointed to see degradation appear to accelerate, with displayed range falling almost daily. 90%, which had originally been 243-245, fell to 233 or 234, with 100% barely eking past 260. Roughly 3.5% degradation in the first year and 16,000 miles. Not significantly worse than promised, but a bit of a bummer, nonetheless.

As recommended at annual service, I did a couple of range charge --> 10% cycles and crept back up to 263 or 264. Not terrible.

The big surprise this summer, approaching 20,000 miles, has been that the last range charge was 267 (vs. original of 270), with subsequent daily charges to 70, 80 or 90% all prorating into the 265-268 range.

Warmer temps? (Summer comes late to SoCal, but once it comes, it can be hot.)

Longer (recreational) runs and fewer seven-mile daily work commutes?

Or the latest firmware upgrade? Today, I was puzzled to see that a 75-miles golf commute which usually averages 300 - 320 Wh/mi and 85-90 range miles instead consumed only 288 Wh/mi and 80 range miles. Same speed and AC use as always.

Anyone else experiencing similar "summer rallies"?
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Jason S

Model S Sig Perf (P85)
Apr 20, 2012
Rocklin, CA
Never kept that close track. However, if it makes you feel any better I just had a couple 100% charges go to 255 miles on my 3.5 year old 43K mile P85. So I wouldn't say the degradation is all that high.


Apr 8, 2015
Flasherz "proved" (correlated) that the Rated Range is directly linked to seasonality. It goes down in the cold weather, and goes back up in the hot weather.


Active Member
Jan 31, 2014
Brea, Orange County
Interesting. Yes warmer temps definitely helps, but not that much. I have definitely seen range vary over the years. Just as a reference point, my car is 2.5 years old, 83k miles and the degradation is about 6%. It definitely slows down. In the beginning to see a drop quickly, then it will go down slower and slower.

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