Our '22 Mustang Mach-E has AWD (2-motor) and the extended range (312 miles EPA) battery (91.7 kWh useable) .
Our '23 Lightning has AWD (2-motor) and the extended range (320 miles EPA) battery (131 kWh useable).
For reasons, we had to drive both to the LA area from Northern AZ.
We told both to be at 100% by the time we left. They were ready to go.
Before we left, we discussed where to stop to charge and use the restroom. The place has to have chargers. Then the truly primary consideration is always how clean are the restrooms and the next rule is how good are the food options. Third is how reliable are the chargers. Needles, CA used to be our restroom+charge break, but the charger choices there do not meet either of our main considerations. A few months ago, I learned of a new charger about 20 miles west of Needles at a Flying J truck stop in Yucca, AZ. It’s across the highway from the Yucca Proving Grounds. I had to stop. The restrooms are infinitely cleaner than the McDs or local greasy spoon in Needles. So this has become our primary stop between NAZ and LA.
When we arrived, all four charging plugs were free. So we each backed in to the spot that made the most sense for our charge port location.
By the way, we never even worried about whether we could find two charging ports at the same time. We just don’t run into that kind of issue very often.
The Mustang had used 50% of its battery to take us ~176 miles.
The Lightning had used 48% of its battery to take us ~176 miles.
Efficiency reported by the Mustang was 3.9 miles/kWh.
Efficiency reported by the Lightning was 2.5 miles/kWh.
Sanity check:
Mustang:
176 miles / 3.9 miles/kWh = 45.1 kWh
45.1 kWh / 50% of the battery used = 90.2 kWh. That’s fairly close to the 91.7 nominal useable battery.
The battery is nearly 4 years old, and has >50k miles on it. IF that small difference was due to battery capacity degradation, that’s only ~ 1.6% degradation in 4 years, >50,000 miles. I’m happy with that.
View attachment 8436
Lightning:
If we believe the 2.5 miles/kWh and we believe the depth of discharge for the Lightning:
176 miles / 2.5 miles/kWh = 70.4 kWh
But.
70.4 / 48% = 146.7 kWh. Which is more than the nominal full capacity, including the “buffer.”
Huh.
What’s going on here?
If we assume the battery state of charge report is correct and 48% of the 131 kWh was used, that’s 62.9 kWh to go 176 miles. That’s an efficiency of 2.8 miles/kWh.
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