Took me a little bit of searching to actually find the source, and to call it a study is a bit an overstatement, however here are some links:<p><a href="https:&#x2F;&#x2F;steinbuch.wordpress.com&#x2F;2015&#x2F;01&#x2F;24&#x2F;tesla-model-s-battery-degradation-data&#x2F;" rel="nofollow">https:&#x2F;&#x2F;steinbuch.wordpress.com&#x2F;2015&#x2F;01&#x2F;24&#x2F;tesla-model-s-bat...</a> [A blogpost about the study]<p><a href="https:&#x2F;&#x2F;docs.google.com&#x2F;spreadsheets&#x2F;d&#x2F;t024bMoRiDPIDialGnuKPsg" rel="nofollow">https:&#x2F;&#x2F;docs.google.com&#x2F;spreadsheets&#x2F;d&#x2F;t024bMoRiDPIDialGnuKP...</a> [The study&#x2F;survey]<p><a href="http:&#x2F;&#x2F;www.daglievemensen.nl&#x2F;tesla&#x2F;maxrange.htm" rel="nofollow">http:&#x2F;&#x2F;www.daglievemensen.nl&#x2F;tesla&#x2F;maxrange.htm</a> [Interactive graph]<p>And as bonus a link to the Tesla Roadster battery study:
<a href="http:&#x2F;&#x2F;www.groen7.nl&#x2F;images&#x2F;wp2013&#x2F;divers&#x2F;PIA-Roadster-Battery-Study.pdf" rel="nofollow">http:&#x2F;&#x2F;www.groen7.nl&#x2F;images&#x2F;wp2013&#x2F;divers&#x2F;PIA-Roadster-Batte...</a>