Would driving more slowly at highway speed preserve battery range?
Slower highway driving reduced aerodynamic losses, which could let the same remaining battery carry an electric car farther. The amount of extra range remained uncertain because wind, elevation, and temperature also mattered.
If the arrival estimate stayed steady, would slowing a little more add useful margin?
A further small speed reduction could add range margin. A steady estimate did not necessarily show that slowing had failed: the prediction could already have adjusted to recent energy use.
What I learnedI learned that air resistance rose quickly at highway speeds. Lower speeds could extend range, but the gain depended on conditions. A steady arrival estimate could already reflect adaptation to lower energy use.
I learned to separate an efficiency improvement from the prediction on the dashboard, which could already be adjusting to it.
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