Introduction to the Cold-Weather Efficiency Test

In our recent comparison testing, we evaluated the 2025 Volkswagen ID. Buzz and the 2024 Kia EV9 to examine their performance in cold temperatures. With many family road trips occurring during the winter months, understanding how these all-electric vehicles handle cold weather is crucial. According to EPA estimates, both models show comparable efficiency, although slight differences exist that are worth analyzing.

Efficiency Ratings and Expectations

The Kia EV9 boasts an impressive 83 mpg-equivalent combined rating, consuming approximately 41 kilowatt-hours per 100 miles driven. In comparison, the ID. Buzz is rated at 80 mpg-e combined with a slight increase in energy usage at 42 kWh per 100 miles. Both vehicles yield about 2.4 miles per kWh, indicating a close contest between the two models. Our expectations were set for a tightly matched cold-weather performance based on these metrics.

Testing Methodology and Results

To conduct our efficiency test, both vehicles were charged to 100% before embarking on a 100-mile route. The conditions were controlled to reflect typical driving habits—normal speeds and climate controls set to maintain comfort. The temperature outside was a brisk 17 degrees Fahrenheit, necessitating closed windows. Midway through the trip, we swapped vehicles for balanced assessment. Upon reaching an Electrify America public charging station, the EV9 had an estimated range of 204 miles after utilizing 21 minutes of charging, reflecting a more efficient energy consumption than the ID. Buzz, which presented a total range estimate of 161 miles after a 23-minute charge. This disparity emphasizes how cold temperatures can affect driving efficiency and overall range.