How Much EV Range Do You Need in Australia? Why the 80/20 Maths Is Wrong

How much EV range do you need? Enough to cover your longest regular drive at highway speed, with a buffer, and for most Australians that is far less than the brochure number suggests. As a rule of thumb, divide that drive by 0.7 and shop for that WLTP figure. A 250 km run calls for about 360 km of claimed range.

Daily driving barely enters into it. EV owners in the Electric Vehicle Council’s 2025 ownership survey drove 13,950 km a year in major cities and 17,620 km in regional areas. That works out to about 38 km and 48 km a day. The same survey found 93% can charge at home.

The sum that scares people is 350 km of range, times the 60% between 80% and 20% charge, which leaves 210 km. It looks logical but mixes up a battery-care habit with a limit on the car. Here is the maths that matters, what real-world testing shows, and how to pick a number. If you are comparing cars as you read, our electric vehicle guide lists the current models and their specs.

How Much EV Range Do You Need? Start With Your Longest Regular Trip

Your longest drive that happens at least monthly sets the size of the car. Rare trips can take a charging stop, and daily trips are already covered.

Pull up a year of your driving if you can. Most people find three bands: an ordinary day, a weekly longer day, and a handful of big trips. Take one typical example. Someone driving 50 km most days, 150 km one day a week and 250 km a few times a year would look at a 350 km car and worry. They shouldn’t. That car handles the first two on an ordinary home charge, and the third from a full battery.

Two quick sums size the car:

• Weekly or more often: divide the drive by 0.55. You can do it inside the 80-to-20 window. A 150 km day needs about 270 km of WLTP range.
• Monthly or less: divide the drive by 0.7. You charge to 100% first and arrive with about 10%. A 250 km run needs about 360 km of WLTP range.

Both divisors come from the table in the next section. They assume you have somewhere to charge at the end of the day. If your destination has no charger and you need to drive straight back, count the round trip.

What a WLTP Figure Delivers on Australian Roads

Expect 75% to 85% of the WLTP figure at 110 km/h with the air conditioning on, and 90% to 100% around town. WLTP (the Worldwide Harmonised Light Vehicles Test Procedure) is a laboratory test used to compare cars on the same basis. It is not a promise about your commute.

Australia is partway through adopting it. The Green Vehicle Guide says ADR 81/03 applies WLTP to new models from 1 July 2026 and to all applicable vehicles by 1 July 2028. Before that, the older and more generous NEDC test was the regulated one, so check which figure an older or used car quotes.

This table turns a claimed range into the three numbers you will actually use. These are Gridly estimates from the midpoints of those bands: 95% of WLTP around town and 80% on the highway.

WLTP range	Example (as of November 2026)	Daily window, 80% to 20%, around town	First highway leg, 100% to 10%	Next highway leg, 10% to 80%
350 km	BYD Atto 2 (345 km)	200 km	252 km	196 km
400 km	Kia EV5 Air Standard Range	228 km	288 km	224 km
450 km	MG S5 Essence 62	257 km	324 km	252 km
500 km	Kia EV5 Earth AWD	285 km	360 km	280 km
600 km	Tesla Model Y Long Range	342 km	432 km	336 km

Speed is the big lever. In a 2022 CarExpert long-distance test, a Kia EV6 used about 20 kWh/100 km at 100 km/h and about 22 kWh/100 km at 110 km/h. That is roughly 9% less range for 10 km/h, on one car on one trip. Our breakdown of real-world range conditions covers hills, wind and heat in more detail, and the EV range calculator lets you test your own route.

Towing changes the sum entirely. At half its rated capacity, an EV typically delivers 40% to 55% of its WLTP range. A 600 km car can become a 240 km to 330 km car before you leave any buffer. If a caravan or boat is part of your life, read our EV towing guide before you choose a battery.

What Real-World Tests Show About Claimed Range

No EV has yet matched its lab figure in Australia’s main independent test, and the gap varies enormously between cars. That matters more than the headline number. A car with a lower claim can go further than a car with a higher one.

The Australian Automobile Association’s Real-World Testing Program drives cars on a 93 km loop around Geelong, then extrapolates range from the energy needed to recharge. These are results reported in its December 2025 and June 2026 rounds:

EV	Lab figure	AAA tested	Shortfall
Tesla Model Y RWD	about 466 km	450 km	3%
Tesla Model Y Long Range	600 km	559 km	7%
Kia EV3 Air Long Range	604 km	537 km	11%
Kia EV5 Earth AWD Long Range	500 km	446 km	11%
Kia EV9 Air RWD	443 km	395 km	11%
BYD Dolphin Premium	490 km	398 km	19%
BYD Atto 3 Essential	410 km	328 km	20%
MG4 Excite 51	405 km	281 km	31%

Look at the Dolphin and the Model Y RWD. The BYD claims 24 km more, yet the Tesla tested 52 km further. Check a car’s AAA result if one exists, because it tells you more than the brochure.

Owners report the same thing in sharper terms, often after a dealer conversation that went badly. One Kia EV5 owner says they were told 550 km would comfortably cover a fortnightly trip, then found about 400 km on a full charge at highway speed. An MG S5 owner reports around 380 km from the 450 km claim. Neither car is faulty. Kia lists the EV5 Air Long Range at 555 km WLTP, and 400 km sits just under the 75% to 85% highway band. Treat any sales promise about a specific trip as a guess, and do your own sums with the highway figure.

Is the 80/20 Rule Limiting Your EV Range?

No. The 20% to 80% habit protects long-term battery health on some chemistries, and manufacturers expect you to go outside it when you need the range. Treat it as your everyday setting, not your car’s capacity.

Advice differs by chemistry, so check your manual:

• NMC batteries (nickel manganese cobalt) are more sensitive to sitting at high charge. Hyundai Australia suggests keeping daily charging between 20% and 80%, and its advice targets long periods at either extreme, not a single trip.
• LFP batteries (lithium iron phosphate) need the opposite. BYD’s Atto 3 Australian handbook recommends a full charge at least weekly, and a full charge from below 10% every three to six months. It also suggests holding 40% to 60% if the car will sit for more than seven days.
• Tesla tells owners of LFP models to keep the limit at 100%, even daily, and to fully charge at least weekly. We read this in Tesla’s international manuals and couldn’t open the Australian edition, so confirm it on your car’s charging screen.

So charge to 100% before a long drive, ideally shortly before you leave. Run down to 10% if the trip needs it. Then recharge rather than parking near empty for days.

The 80% figure does matter on the road for a different reason. DC charging slows sharply near full, so stops usually end at about 80%. That’s why the third column in the earlier table is smaller than the second. Your first leg is your longest, and every later leg is about a fifth shorter.

How Battery Ageing Changes the Answer

Allow for losing roughly a fifth of your range over eight years if you plan to keep the car that long. Geotab’s January 2026 study of more than 22,700 EVs found an average loss of 2.3% a year. It uses overseas fleet data, so treat it as a guide. Cars mainly using high-power DC charging lost up to 3.0%, against about 1.5% for cars mainly on AC.

At the average rate, a 350 km car would be closer to 285 km after eight years. Australian data looks at least as good so far. Pickles reported in February 2025 that more than 250 used EVs averaged 90.1% battery health at 120,000 km. Warranties typically guarantee 70% for eight years, though the kilometre caps vary, as our EV battery warranty guide shows.

For the buyer, the practical point is modest. If the sums for your longest regular trip only just work today, go one size up or plan on adding a short stop in later years.

How Much Range You Need by Situation

Most households with home charging do fine with 350 km to 450 km. Drivers who tow, cover long regional distances or can’t charge at home have good reasons to buy more.

Your situation	Claimed range to look for	Why
City or suburban, home charging, occasional trips	300 km to 400 km	Daily driving is well inside the window, and rare trips can take a stop
Second car in a two-car household	Under 300 km can work	The longer car covers the big trips
Regular 150 km to 200 km days	400 km to 450 km	Stays inside the daily window without fast charging
Regional, regular 250 km to 350 km runs	500 km or more	Keeps a buffer at highway speed and in heat
No home charging	400 km or more	Fewer trips to a public charger, not a need for distance
Regular towing	500 km or more, and check the tow rating	Towing can cut range by about half

Home charging is why smaller batteries work. A standard 10 amp portable charger delivers about 1.8 kW to 2.3 kW, so 10 hours overnight adds 18 kWh to 23 kWh. At 17 kWh/100 km, that is roughly 105 km to 135 km, which is more than most people’s daily driving. Our comparison of a granny charger and a wall charger explains when an upgrade pays off.

Without home charging, a bigger battery buys you time, not necessarily money. On a 38 km day, a 400 km car lasts about six days inside the 80-to-20 window, while a 300 km car lasts about four and a half. Public charging is also where the running-cost gap narrows. Peak rates at major networks in Sydney were about $0.59 to $0.79 per kWh as of July 2026, according to CarsGuide.

Can You Rely on Fast Chargers for the Rest?

On major east coast corridors, mostly yes. Off them, plan more carefully and carry more buffer.

The Electric Vehicle Council counted 4,268 public charging locations and 11,602 connectors at June 2026, across all speeds. On the Hume, the Australian Electric Vehicle Association’s volunteer audit in mid-2026 gave a B+ grade across 221 plugs at 45 locations. Twelve of the 195 CCS2 plugs were out of service, about 6%, but every site had at least one working charger.

That is good enough to treat a charging stop as routine on that road, but not to arrive at one with 2%. Ampol’s charging guide puts a 10% to 80% charge on a 150 kW unit at about 30 to 50 minutes, and the real figure depends on your car’s charging curve. Our EV road trip guide covers which routes work well and which still need careful planning.

Bigger batteries cost more, weigh more and are often less efficient. Paying for 600 km to cover a trip you take twice a year rarely makes sense when a long lunch stop would do the job. Buy for your regular life, then plan around the exception.