You glance at your Tesla's range figure, do the mental maths for your journey, and then watch the number fall faster than expected on the motorway. It's one of the most common frustrations new owners report — and it's not a fault. It's a result of how the displayed number is actually calculated, and which of several different “range” figures you happen to be looking at.
Three Different Numbers, One Display
Your Tesla shows you more than one kind of range, and they don't always agree. The headline “rated range” next to your battery percentage is calculated from a fixed, EPA- or WLTP-derived efficiency figure — it doesn't change based on how you actually drive. The “projected range” shown on the Energy app graph is different: it's based on a trailing average of your own recent energy consumption, over a 5-mile, 30-mile, or last-trip window that you can select. Then there's the range you actually get on any given drive, which depends on your speed, the temperature, how much climate control you're running, and the terrain. All three are legitimate numbers — they're just answering different questions.
Why the Headline Figure Is EPA/WLTP-Anchored
The rated range on your battery icon is built on the same standardised test procedures used to compare fuel economy and range figures across every manufacturer — the EPA's test cycle in the US, WLTP in Europe and the UK. These tests run at moderate, steady speeds, in mild temperatures, with minimal climate control demand. They exist to let you compare one car's efficiency against another's on a level playing field, not to predict exactly what you'll get on a specific cold, motorway-heavy commute. Every EV maker's headline figure works this way — it isn't a Tesla quirk, and it isn't a broken promise. It's a lab benchmark wearing a real-world unit.
The Energy App Is the More Honest Number
The Energy app's projected range is a genuinely useful figure because it's built from your own recent driving, not a lab test. The catch is the averaging window: if your last five miles were all downhill motorway cruising, the short window will look optimistic; if they were all stop-start city driving in the cold, it'll look pessimistic. For trip planning, the 30-mile trailing average is usually more representative than the 5-mile window, since it smooths out short bursts of unusually efficient or inefficient driving.
It's also worth knowing that the “range at 100%” figure is itself derived from the battery management system's current estimate of your usable capacity — which is why running Tesla's built-in battery health test can shift your displayed range slightly without your actual battery capacity having changed at all. The test recalibrates the estimate the BMS uses; it doesn't restore lost capacity.
Winter and Motorway Reality
The gap between rated range and real-world range widens considerably in cold weather and at higher speeds. Freezing conditions typically bring 15%–25% range loss, and cabin heating alone has been measured to cut range by up to 41% at around -7°C (20°F) in independent testing. Motorway speeds compound this: aerodynamic drag increases with the square of your speed, and cold air is roughly 10% denser than warm air, meaning more resistance at any given speed. None of this is a fault — it's physics — but it's exactly why a rated-range number calculated at mild temperatures and moderate speeds can feel wildly optimistic on a cold motorway drive in January.
For the full breakdown of how much range you actually lose in winter — and nine ways to claw some of it back — see our complete cold-weather range guide.
Read the Winter Range GuideHow to Plan With It Instead of Against It
Use the Energy app's 30-mile trailing average for everyday planning rather than the rated range shown at 100% — it reflects your actual recent driving, not a lab test. For road trips, lean on Tesla's built-in trip planner, which accounts for elevation, live weather, and battery preconditioning far more precisely than a mental subtraction from the rated figure ever could. And if you're evaluating range for your specific car, season, and driving style rather than just the marketing number, a calculator built around real-world conditions will get you closer to the truth than the number on the box.
Get a range estimate tailored to your Tesla, your route, and the season — not just the EPA/WLTP number.
Try the Range EstimatorThe Bottom Line
Your Tesla's range estimate isn't lying to you — it's just several different numbers wearing the same display. The rated figure is a standardised benchmark, the Energy app's projection reflects your own driving, and the number you actually get depends on conditions on the day. Once you know which figure you're looking at and why it moves, the “why is my range dropping” anxiety mostly disappears.