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New data with no Sentry or other "vampires", headlights off, AC on:
- 26 kWh corresponds to 47% battery drop (80% -> 33%) => max charge = 26 / 47 * 100 = 55kWh == 73% of new battery (75kWh)... is 27% capacity drop over 57k miles normal and expected !?
- unrelated: 408 Wh / mile average over 65 miles round trip with little traffic - not sure where all this energy goes
408 Wh/m is very high. My lifetime average on my 2016 75S was 330 Wh/m and it is less efficient than a 75D and I don't normally strive for optimum conditions.
Driving things that could cause this high drain:
- High Speeds
- Hard acceleration (and often new owners do this as it's so much fun)
- Hard braking (which doesn't use much regen)
- Headwinds
- Cold or hot weather (although less of a factor)
- Rain/Snow (causes more friction)
Items that have little effect:
- Radio/Music
- Headlights
Technical issues:
- Bad wheel bearings (higher friction)
- One of two motors dead (you'd get major warnings)
- Lack of low-rolling resistance tires (LRR tires are normal, but perhaps someone replaced them with non-LRR tires)
- Under inflation of tires (but above the point of a warning)