How is EV range measured?
An electric car's advertised range in the US is its EPA rating: a number from standardised lab driving tests, adjusted to allow for things like air conditioning, cold weather and high speeds. It's a fair way to compare cars, but your real range depends on your speed, the temperature and how you drive.
EPA range is like the "serves 4" on a recipe. It's measured the same way for every car so you can compare — but if you're very hungry (driving fast in winter), it won't stretch as far.
Where the number comes from
The US Environmental Protection Agency tests cars on a dynamometer — basically a treadmill for cars — through set city and highway driving cycles. The results are then adjusted to account for real-world factors the lab test doesn't include, such as air conditioning, cold temperatures, and high-speed or aggressive driving.
What changes your real range
Speed, temperature and heating matter most. The US government's fueleconomy.gov reports that in cold weather (20°F / about −7°C) an EV's range can drop by around 41% in mixed driving, with about two-thirds of the extra energy going into heating the cabin.
Independent testers like Edmunds and Consumer Reports run their own steady 70 mph highway tests. Sometimes cars beat their EPA rating — as the PixProofs below show — and sometimes they fall short.
What MPGe means
MPGe — "miles per gallon equivalent" — lets you compare electric and petrol cars. It treats 33.7 kWh of electricity as equal to the energy in one gallon of petrol. A plug-in hybrid's MPGe only applies when you actually keep it charged.
▸ THE HYPE VS WHAT WE FOUND
Real claims involving this term, each checked in a PixProof with linked sources.
▸ PIXPROOFS THAT USE THIS TERM (8)
▸ COMPANIES BEHIND IT
HYPE OR REAL?
"Rivian's "330 miles of EPA-estimated range" for the R2 turned out to be exaggerated."
The answer: Hype. The opposite — the EPA certified the R2 Performance at 335 miles, slightly more than Rivian claimed.
See the full Rivian R2 PixProof → Play 12 more in Buy or Bye? →▸ QUICK QUESTIONS
- Why is my EV's range lower than advertised?
- Usually speed, cold weather and cabin heating or cooling. fueleconomy.gov reports range can fall by around 41% in freezing weather with the heater on.
- What is MPGe?
- Miles per gallon equivalent: 33.7 kWh of electricity counts as one gallon of petrol, so you can compare EV and petrol efficiency.
- Is EPA range accurate?
- It's a standardised, adjusted estimate — good for comparing cars. Independent highway tests sometimes beat it and sometimes fall short.
▸ SOURCES
- US EPA — Fuel Economy and EV Range Testing ↗
- fueleconomy.gov — Fuel Economy in Cold Weather ↗
- fueleconomy.gov — The Fuel Economy Label for Electric Vehicles ↗
Spot something wrong? Tell us — corrections are logged, see methodology.