(old-ish study, apologies, but was cutting edge circa 2010, but still stands re: LiFePO2 which I'm betting your '14 production car is using) -> http://ecec.mne.psu.edu/pubs/2010-zhang-jps.pdf Page 2, Column 2, Figure 1, Top chart. 300 deep-cycles @ ~92%, 600 @ 74%.
If you're the average SV guy who 'daily drives' his Tesla 20 miles from Oakland to his lofted startup where there's 220 to full-charge before you go home, you'll get 2%. Johnny in Kentucky working the coal miles doesn't have that luxury and will certainly enter into 'deep charge' consumption. (600 cycles -> ~75%, with 2nd deriv of batt life w/r/t cycle being negative, i.e., progressively decreasing losses).
Again, not in the field professionally, but these opinions are consistent with my friends who are working at the forefront (albeit, a statistically small sample space, I openly concede !)
Tesloop, the transport company that'll shuttle you between LA and Las Vegas via Model S, has only seen 6% degradation over 180k miles on their vehicle; this is with ignoring Tesla's advice not to charge to 100% every time at Superchargers.
If by daily driver you mean weekly 300mi weekly roundtrip that usually ends around 5-10% and ~30 miles a day otherwise then sure.
My numbers line up with what most Tesla owner experiences. If your friends are at the forefront of the profession then I'd be a bit worried about whoever they're working for.
If you're the average SV guy who 'daily drives' his Tesla 20 miles from Oakland to his lofted startup where there's 220 to full-charge before you go home, you'll get 2%. Johnny in Kentucky working the coal miles doesn't have that luxury and will certainly enter into 'deep charge' consumption. (600 cycles -> ~75%, with 2nd deriv of batt life w/r/t cycle being negative, i.e., progressively decreasing losses).
Again, not in the field professionally, but these opinions are consistent with my friends who are working at the forefront (albeit, a statistically small sample space, I openly concede !)