The 75-mph Highway Range Test: Every EV We've Measured, Ranked

> Why this ranking matters more than any other: Constant highway cruising is where official figures flatter most and where range anxiety actually bites. This is our running leaderboard of every EV measured on a fixed 200-mile route at a constant 75 mph — the single most useful range number for anyone who drives distances. > > Populate with your own measured results. Update as each new test is completed.

Why 75 mph is the number that matters

Most range figures — WLTP, EPA, MIDC — are composites, blending urban, suburban and highway driving. That's reasonable for comparison, but it means no official figure tells you what happens on a long motorway journey, which is precisely when range matters most.

The physics is unforgiving: aerodynamic drag rises with the square of speed. A car cruising at 75 mph faces roughly 44% more drag than the same car at 62 mph, and drag is the dominant energy consumer at highway speed. That's why urban EV range often meets or beats official figures while highway range falls well short.

A constant-speed highway test is therefore the hardest realistic case, and the most useful single number for anyone planning long trips.

The test protocol

| Element | Standard | |---|---| | Speed | Constant 75 mph (indicated, GPS-verified), cruise control engaged | | Route | Fixed 200-mile highway loop, minimal elevation change | | Start | 100% charge, battery preconditioned to normal operating temperature | | Climate | 21°C cabin — on, in both directions | | Load | Driver plus standard test equipment | | Tyres | As delivered, at manufacturer-specified pressures | | Recorded | Ambient temperature, wind speed and direction, elevation change, mi/kWh, energy consumed | | Wind correction | Route run in both directions to cancel prevailing wind |

The bidirectional run matters. A 15 mph tailwind can flatter a range figure substantially; running the loop both ways and averaging removes most of that distortion. Any highway range figure recorded in one direction only should be treated sceptically.

The running leaderboard

Populate with measured results as tests are completed. Ranked by measured 75-mph highway range.

| Rank | Vehicle | Official (EPA/WLTP) | Measured @ 75 mph | Retained % | mi/kWh | |---|---|---|---|---|---| | 1 | [to be measured] | | | | | | 2 | [to be measured] | | | | | | 3 | [to be measured] | | | | |

Candidates already covered in this section, awaiting measurement:

| Vehicle | Official claim | Notes | |---|---|---| | BMW i3 50 xDrive | 559 mi WLTP / ~440 mi EPA | 108.7 kWh, 800V — likely a strong performer | | Tesla Model Y Long Range RWD | 387 mi WLTP | ~4.4 mi/kWh claimed; class-leading efficiency | | Hyundai Ioniq 9 | 335 mi (RWD S) | 110 kWh, 800V, our 9/10 family EV | | Porsche Cayenne Electric | ~399 mi WLTP (UK base) | 113 kWh — heavy, but efficient for its mass | | Chevrolet Bolt | ~250–255 mi | 65 kWh LFP; urban-focused | | Zeekr 7X (100 kWh) | 382 mi WLTP | ~3.5 mi/kWh claimed | | Rivian R2 Standard LR | 345 mi | Single-motor RWD |

Our test conditions: [to be completed per vehicle — date, ambient temperature, wind, elevation profile, tyres]

What we expect the ranking to reveal

1. Retention percentage will be more revealing than absolute range. A car retaining 80% of its official figure at 75 mph is fundamentally more honest — and more predictable to live with — than one retaining 65%, regardless of which goes further. We'd encourage readers to sort by retention, not distance.

2. Efficiency will beat battery size. Expect efficient cars with moderate batteries to outperform inefficient cars with large ones. Aerodynamics, weight and drivetrain efficiency determine highway range far more than raw kWh. This is why a Model Y with 75 kWh can rival cars carrying considerably more.

3. Aerodynamics will dominate. At a constant 75 mph, drag coefficient and frontal area are the controlling variables. Expect saloons and low-drag shapes (the i3, Model 3) to retain a higher percentage than tall SUVs, even where the SUV's absolute range is greater.

4. 800-volt architecture won't help range directly. It helps charging, not efficiency. Its benefit appears in the recovery time, not the distance — a distinction worth keeping clear.

How to use this ranking

If you drive long highway distances regularly: this is the most relevant range table we publish. Sort by measured range for absolute capability, and check retention percentage to understand how predictable a car will be.

If you drive mostly in town: this table is your worst case, not your expectation. Urban EV range frequently meets or exceeds official figures, for the reasons set out in our India range test — no idling consumption, regenerative recovery, minimal drag.

Combine it with charging speed. As we keep emphasising, a car with less highway range but far faster charging can be more practical. Read this table alongside our charging-curve test rather than in isolation. The i3's likely combination of strong highway range and 400 kW charging is the genuinely significant achievement.

The bottom line

Constant-speed highway running is the hardest realistic test of EV range and the least well served by official figures, which blend in low-speed driving that flatters the result. A 75-mph fixed-route test, run in both directions with the climate control on, produces the number that actually predicts long-journey capability.

Expect efficiency to matter more than battery size, aerodynamics to dominate, and retention percentage to be more revealing than absolute distance. And read the results alongside charging speed, because for real-world long-distance usability, how fast you can recover range increasingly matters as much as how much you started with.

We'll keep this leaderboard updated as each test is completed.

• Constant 75-mph highway running is the hardest realistic EV range test and the one official composite figures flatter most
• Aerodynamic drag rises with the square of speed — a car at 75 mph faces ~44% more drag than at 62 mph
• Retention percentage (measured vs official) is more revealing than absolute range for predicting real-world behaviour
• Expect efficiency and aerodynamics to matter more than battery size; 800-volt architecture helps charging, not range
• Read this leaderboard alongside charging speed — faster recovery can outweigh a shorter highway range

Key takeaways

• Constant 75-mph highway running is the hardest realistic EV range test and the one official composite figures flatter most
• Aerodynamic drag rises with the square of speed — a car at 75 mph faces ~44% more drag than at 62 mph
• Retention percentage (measured vs official) is more revealing than absolute range for predicting real-world behaviour
• Expect efficiency and aerodynamics to matter more than battery size; 800-volt architecture helps charging, not range
• Read this leaderboard alongside charging speed — faster recovery can outweigh a shorter highway range