You find a three-year-old crossover with an EPA-estimated range of 250 miles. Your commute is 40 miles round trip, so one charge a week should cover it easily. Then you actually drive it. A cold morning trip on the highway eats up far more indicated range than it should, while a mild afternoon of errands barely touches the battery.
The sticker number didn't lie, but it didn't tell the whole story. Closing that gap is the most useful thing you can do before buying a used EV.
How That EPA Number Actually Gets Made
The range on a window sticker doesn't come from someone driving around town. It comes from a lab, where the EPA tests vehicles on a dynamometer, a stationary device lets the wheels turn in place while sensors measure energy use. The test blends into a city cycle that mimics stop-and-start traffic with a highway cycle that simulates steady cruising, though at speeds below what most interstates allow. The two are weighed roughly 55 percent city and 45 percent highway, then adjusted to better match real driving. All of it runs around 70 degrees with the heat and air conditioning off, about as gentle as driving gets.
So, the EPA-estimated range is genuinely useful for comparing models on equal footing. It just isn't a promise about what you'll see in your driveway.
Speed Is the Biggest Lever You Control
Gas car habits don't transfer to EVs. Highway driving has always been the efficient choice in a gas engine, but electric motors work the opposite way. Around town, slowing down lets regenerative braking capture some of that momentum and send it back into the battery. On the highway, you rarely brake, and you're constantly fighting air resistance, which grows sharply as speed increases.
Independent highway testing from outlets like Consumer Reports, Edmunds and InsideEVs has repeatedly found that sustained 70 mph driving can pull an EV's range down 20 to 30 percent below its combined EPA figure. A few aerodynamic models beat their rating even at speed, but most fall short on long highway stretches. If your daily driving is mostly highway miles, plan for less range than the listing suggests.
Temperature Is the Wild Card
Weather moves the range number more than anything else, but the data on this gets reported two different ways.
A widely cited AAA lab test found that at 20°F with the heater running, EVs experienced a 39 percent decrease in calculated driving range, while at 95°F with the air conditioning on, the reduction was about 8.5 percent compared with moderate temperatures. Real-world fleet data tells a gentler story: Recurrent, a company that tracks tens of thousands of EVs, found the average car retains about 80 percent of its range in freezing weather.
Neither number is wrong. The AAA test represents a continuous worst case in a lab, while Recurrent's data reflects how people actually drive, including time parked in a garage, preconditioning before a trip and a mix of speeds.
The part worth repeating to anyone nervous about EV range in cold weather: the loss is temporary. Cold slows the chemistry inside the battery and thickens the air outside it, but it doesn't cause lasting damage, and full range returns once temperatures rise.
Two things help blunt the winter hit:
A heat pump. Newer EVs equipped with one instead of a resistive heater lose noticeably less range, since a heat pump moves heat efficiently rather than pulling raw power straight from the battery.
Preconditioning. Warming the cabin through a phone app while still plugged in draws that energy from your outlet instead of the battery.
Battery Degradation Is a Different Problem Entirely
It's easy to lump cold-weather range loss and battery aging together, but they aren't the same. One comes back with warmer weather. The other doesn't, though it also happens far more slowly than most people assume.
Fleet tracking firm Geotab puts average EV battery degradation at around 2.3 percent of original capacity per year, a pace slow enough that most packs are expected to outlast the rest of the car, often running past 100,000 miles without becoming a real limitation. A used EV kept in a mild climate and charged gently might retain nearly all of its original capacity after five years, while one driven hard in extreme heat or charged almost exclusively at DC fast chargers may show a bit more wear. This is the number a battery health report can actually verify, unlike daily swings caused by weather.
The Smaller Stuff That Still Adds Up
A few everyday factors behave just like they do in a gas car, only with smaller margins to work with. Hills drain a battery quickly going up, and regenerative braking only returns part of that energy coming down. A fully loaded car, whether with cargo or passengers, takes more energy to move. Large wheels and grippy tires increase rolling resistance, while EV-specific replacement tires built for low resistance can claw some range back. Roof boxes, underinflated tires and aftermarket electronics chip away at efficiency too.
What This Means When You're Actually Shopping
EVs have come a long way fast. The Department of Energy puts the median EPA range for model year 2024 vehicles at around 283 miles, so even a used model with some age often has plenty left for typical use.
Before buying a specific car, do three things:
Check the remaining battery warranty. Federal rules require EV batteries to be covered for at least eight years or 100,000 miles, up to 10 years or 150,000 miles in California emission states. Confirm how much transfers to a new owner.
Ask for a battery health report. A report from a service like Recurrent shows actual degradation rather than an estimate, much like a vehicle history report but for the battery.
Do the math on your real worst case. Add about 30 percent to your daily round trip as a buffer for cold weather and highway driving. If you need 60 miles a day, a used EV with a real-world, already-degraded range of 100 miles will hold up fine, often for thousands less than a new car with a battery far bigger than you'll ever use.
Buy on the sticker number and you're gambling. Buy on what the car actually does in cold weather, on the highway, with a few years already on the battery, and you'll know before you sign whether it fits your life.
