Recent versions of the 7.1 firmware update, including the widely distributed version 22.214.171.124.126 have included a note under "Additional Improvements" that reads: -- Regenerative braking at low temperatures has been improved. -- I wrote to email@example.com, to ask just what this meant. I want to make sure that my wife and I are doing whatever we need to do settings-wise to best take advantage of this improvement. Unfortunately the response I received doesn't answer the question. Below is a copy of the message I sent, followed by the response I received. I am hoping in time we may get more information from Tesla, or we may be able to figure out ourselves what has changed. My email message to Tesla: -- In the release notes of the firmware update my Model S received last Friday I noticed the following line under “Additional Improvements:” “Regenerative braking at low temperatures has been improved.” I’m wondering if you might be able to shed some more light on this and let me (and my wife) know in what way it has been improved? Is the regenerative braking limit likely to go away sooner, and if so is that true with both range mode on and range mode off? Or is the limitation likely to be less of a limitation in the first place? I ask because in the limited amount of time we have driven the car since receiving the firmware update, all of which has been with range mode on, we have not noticed a difference. We’d like to know what we should be looking for, and also what changes we might want to make to maximize the benefits of the changes Tesla has made. Thanks very much. Sincerely, -- Tesla's Response: -- Thank you for contacting Tesla Motors Technical Support. Unfortunately we do not have any specifics on the actual expectation for what you should experience. Range mode could affect this, as it limits the heating power the vehicle uses both in the cabin and for the battery. The battery will always stay at a safe level for reheating but will take some time to heat up to optimal operating temperature. Also because of the variables that do go into this that can be very different every single drive the vehicle is on (original battery temperature, exterior temperature, driving style), it may be difficult to see a direct improvement in one certain number for this system. Have a good day, --- I am planning on following up, but not really expecting a much better answer.