One of the biggest factors that influences vehicle efficiency is tires - the difference between summer and winter tires could be several percent or more.
Tesla Model S
Teslavangelist recently tested its Tesla Model S with snow and summer tires on the same route and under similar circumstances (temperature, almost no interior heating, etc.).
The results were:
- winter tires: 357 Wh/mi (222 Wh/km)
- summer tires: 334 Wh/mi (208 Wh/km)
"As spring arrives in MI, I test my snow tires (Blizzaks) and stock Model S tires (Michelin) to determine the difference in energy use. Because it was about 50° F, the snow tires probably were a little soft, so the difference may be less when it's colder (and the snow tires rubber is more firm)."
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Higher range in the transitional period will start to fade again as with the arrival of summer typically brings with it the need to use A/C.