| Efficiency | Range |
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How EV Range Is Calculated
Range is simply usable battery energy times efficiency. A 75 kWh pack at 3.5 miles per kWh gives a little over 260 miles on paper. The two levers are battery size, which you cannot change, and efficiency, which depends heavily on how and where you drive. Knowing both lets you plan trips and charging stops with confidence.
Why Real Range Falls Short
The rated number is measured under mild, steady conditions. Cold weather saps both battery output and cabin heat, highway speed multiplies aerodynamic drag, and hills, headwinds, and towing all demand more energy per mile. In a hard winter at speed, usable range can drop by a third or more, so build in margin.
Charging Habits and Usable Range
For long battery life, many manufacturers suggest charging daily to around 80 percent and only filling to 100 percent before a trip. That makes your everyday usable range a window rather than the full pack. Planning around a reserve, rather than running to empty, keeps a buffer for detours and protects the battery.
Frequently Asked Questions
What efficiency should I expect?
Most EVs average 3 to 4 miles per kWh in mixed driving, less in cold or at high speed, more in gentle city use. Use your own trip-computer figure if you have it.
Should I use total or usable battery size?
Use the usable figure, which is slightly smaller than the nominal pack size because a buffer is held back to protect the cells.
How much range do I lose in winter?
Commonly 10 to 30 percent, occasionally more in severe cold with heavy heater use. Preconditioning while plugged in helps recover some of it.