Lead Hook
When Car and Driver unveiled its "Longest‑Range Electric Cars We've Ever Tested" list, the headline numbers—410 mi for the Lucid Air Grand Touring, 400 mi for the Chevrolet Silverado EV, 400 mi for the Mercedes‑Benz EQS‑450+—immediately grabbed attention. For consumers still wrestling with range anxiety, those distances sound like a decisive answer. Yet the story stops short of explaining how the test was run, what assumptions underpin the results, and why the figures matter beyond a magazine’s road‑trip challenge. In an industry where range claims drive purchasing decisions, the methodology itself can reshape expectations, influence battery engineering, and pressure regulators to reconsider how official efficiency numbers are calculated.
Deep Dive
Car and Driver’s "75‑mph real‑world highway range test" is designed to simulate long‑distance cruising rather than the mixed‑city cycles used by the EPA. The test runs each vehicle at a constant 75 mph—a speed the publication describes as "typical for long‑distance highway driving"—until the battery is depleted. This approach deliberately pushes the powertrain into a higher‑average consumption zone, yielding a range that is typically lower than EPA estimates but arguably more reflective of a highway‑only trip.According to Car and Driver, the Lucid Air Grand Touring (819 hp) achieved a 410‑mile real‑world range in this test. The same source notes that the all‑wheel‑drive 480‑hp Air Pure managed 300 miles on a 92.0‑kWh pack, while the rear‑drive 430‑hp Pure (2024 model) achieved 300 miles despite sharing the same battery capacity. These figures illustrate how drivetrain configuration and battery size interact under a constant‑speed load.
The Chevrolet Silverado EV, equipped with a 205 kWh battery pack shared with the GMC Hummer EV pickup, posted a 400‑mile range on the 75‑mph run. The dual‑motor all‑wheel‑drive RST variant also averaged a 198 kW charging rate from 10 % to 90 % state of charge, taking 58 minutes for that charge, per the same source. This rapid‑charging performance, while impressive, is framed against a full‑charge capacity that is among the largest on the market, highlighting how battery volume can mask charging speed limitations.
Mercedes‑Benz’s EQS‑450+ rear‑drive entry model, tested in 2022, also reached 400 miles, and a 2025 all‑wheel‑drive EQS‑450 matched that figure. The more powerful dual‑motor EQS‑580 4Matic delivered 350 miles, while the AMG‑badged version managed 290 miles. These variations underscore that higher power does not linearly translate to longer range when the test holds speed constant; aerodynamic drag and drivetrain losses become dominant factors.
Heavy‑weight SUVs such as the Cadillac Escalade IQ, weighing just under five tons, still managed 380 miles on the same test, thanks to the same 205‑kWh battery pack. The vehicle’s 0‑60 mph sprint of 4.5 seconds, noted by the source, demonstrates that large battery packs can support both performance and range, but the trade‑off is increased vehicle mass, which can affect efficiency on real‑world mixed‑traffic routes.
Among the more affordable luxury offerings, the Porsche Taycan’s base rear‑drive model achieved 360 miles, while the entry‑level Mercedes CLA‑250+ Electric, priced under $50,000, posted 340 miles. The CLA‑350 Electric, not yet tested, is expected to exceed 300 miles, illustrating how price tier and powertrain layout influence outcomes.
Two SUVs—Mercedes‑Benz’s EQS‑class SUV (2024 EQS‑450+) and the Rivian R1S Dual‑Motor with the Max battery pack—both recorded 340 miles and 320 miles respectively. The Porsche Macan Electric, a rear‑drive crossover, logged 320 miles, trailing the Taycan by 40 miles but offering a distinct SUV form factor.
All of these results hinge on a single testing protocol that emphasizes a steady 75 mph speed. The methodology does not account for stop‑and‑go traffic, climate control loads, or regenerative‑braking gains that can substantially alter real‑world consumption. Consequently, the numbers serve more as a comparative benchmark within Car and Driver’s own test fleet than as definitive consumer‑grade range predictions.
Audit & Contradictions
The announcement’s headline figures are all derived from one source—Car and Driver’s in‑house testing. The fact‑check audit flags each of these claims as single‑source: the Lucid Air Grand Touring’s 410‑mile result, the Silverado EV’s 400‑mile figure, the EQS‑450+ 400‑mile outcome, the Escalade IQ’s 380‑mile achievement, the Taycan’s 360‑mile performance, and the Silverado’s 198 kW charging rate with a 58‑minute charge window. No independent outlet in the corroboration list repeats these specific numbers, so the claim level remains low‑contradiction but unverified beyond the primary report.
What the article does not say is how the 75‑mph constant‑speed test compares to official EPA ratings, which are derived from a mixed‑cycle that includes city driving, higher speeds, and accessory loads. The omission leaves readers without a clear sense of how much real‑world mileage might differ in everyday use. Moreover, the source does not disclose ambient temperature conditions, tire pressure, or whether the vehicles were equipped with optional aerodynamic packages—all factors that can swing range by tens of miles.
Because the data are single‑source, the audit notes a "Low" contradiction level, meaning no direct conflicts were found but the reliance on one test lab limits confidence. Consumers and analysts should treat the figures as indicative of each model’s best‑case highway performance rather than guaranteed daily driving range.
Future Outlook
Car and Driver’s high‑speed test could set a new informal benchmark that manufacturers feel compelled to meet. If consumers begin to compare vehicles based on 75‑mph highway mileage, automakers may prioritize aerodynamic efficiency, low‑drag designs, and larger battery packs to chase headline numbers. This pressure could accelerate the adoption of higher‑energy‑density cells, but it may also widen the gap between premium models (which can absorb larger packs) and mass‑market EVs that must balance cost and weight.
Regulators may respond by revisiting how official range figures are presented. The EPA’s current testing regime already includes a separate “highway” cycle, but the prominence of a 75‑mph constant‑speed metric could prompt calls for a more transparent, multi‑scenario disclosure—similar to how fuel‑economy labels now show city, highway, and combined figures.
Competitors will watch the market reaction closely. If the Lucid Air’s 410‑mile claim spurs a surge in pre‑orders, rival brands may accelerate development of larger‑capacity packs or introduce software‑based range‑optimizing modes. Conversely, the high‑capacity battery packs that enable the Silverado EV and Escalade IQ to post 400‑plus miles also raise questions about supply‑chain constraints, given the current global demand for lithium‑ion cells.
Ultimately, the story underscores that range is a multi‑dimensional metric, shaped as much by testing methodology as by battery chemistry. As the industry pushes toward 500‑mile targets, the way those numbers are generated and communicated will be as consequential as the engineering feats behind them.