Tesla Cybercab Full Specs Revealed: The EPA Leak That Shows a 47.6 kWh Robotaxi

The technical specifications for Tesla's purpose-built robotaxi are no longer a mystery. A set of EPA certification documents, filed by Tesla on May 21, 2026, and officially certified on May 26, has given the public its first detailed look at the 2026 Cybercab's engineering . The filings, submitted under test group TTSLV00.0L1A, were a necessary regulatory step for the autonomous vehicle to enter US commerce, and they reveal a vehicle optimized ruthlessly for efficiency, cost, and the demands of high-utilization fleet service .

A Platform Built for a Specific Mission

Every design decision on the Cybercab points toward its singular purpose as a driverless ride-hailing vehicle. The specifications confirm a machine that is light, efficient, and mechanically simple, trading raw power and all-wheel-drive complexity for maximum range per kilowatt-hour.

Chassis, Weight, and Dimensions

The Cybercab's curb weight is one of its most significant specifications, coming in at 3,113 lb (1,412 kg) . This makes it roughly 750 lbs lighter than a Tesla Model 3, placing it in the company of traditional lightweight sports cars, though the weight penalty of the battery pack is still substantial . The Gross Vehicle Weight Rating (GVWR) is listed at 3,730 lb, implying a payload capacity of around 617 lbs for passengers and cargo .

Powertrain: A Historic First for Teslas Passenger Cars

In a major departure from Tesla's rear-wheel-drive and all-wheel-drive history, the Cybercab uses a front-wheel-drive (FWD) layout . This arrangement is a practical choice for a robotaxi, where packaging simplicity, maximizing interior space, and reducing manufacturing costs are more important than delivering a performance-oriented driving feel .

Power comes from a single AC 3-phase permanent magnet motor mounted on the front axle. It is rated at 163 kW, which translates to 219 horsepower (or ~216 bhp), and is mated to a single-speed automatic transmission . Regenerative braking is handled electrically by the front wheels .

Battery Pack and Real-World Range

Tesla did not equip the Cybercab with a massive 100+ kWh battery pack. Instead, the EPA documents reveal a compact lithium-ion pack designed for efficiency:

• Voltage: 326V
• Amp-hour Capacity: 146 Ah
• Total Capacity: Approximately 47.6 kWh
• Specific Energy: 154 Wh/kg, which suggests a pack weight of about 680 lb (309 kg)

The EPA filings include an unadjusted lab test range, but the real-world estimated figure is what matters for fleet operations:

• EPA Unadjusted Combined Range: 418.2 miles (673 km)
• Certified Equivalent All-Electric Range (EAER): 418 miles
• EPA Adjusted Real-World Range (Estimated): By applying the standard ~0.7 correction factor used for EVs, the lab result translates to an estimated 293 miles (~471 km) of combined driving range. This aligns with ranges reported and estimated by multiple outlets .

The total AC recharge energy required to go from empty to full is listed as 53.365 kWh, which accounts for the charging losses that occur between the wall power and the battery . This figure is about 12% higher than the pack's usable capacity, which is typical for an electric vehicle .

Unrivaled Efficiency

These specifications create a class-leading efficiency profile. Tesla has pegged the Cybercab's consumption at 165 Wh/mi, a figure that would make it the most efficient production EV ever tested . This hyper-efficiency is the direct result of a lightweight chassis, a streamlined body, and a powertrain that is no larger than necessary for the task at hand.

Regulatory Context and What Comes Next

The leaked documents are a Certificate of Summary Information (CSI) and a Certificate of Conformity, which the EPA issues to confirm that a vehicle meets all applicable federal emissions standards under the Clean Air Act . The certification for test group TTSLV00.0L1A was certified on May 26, 2026, and covers Federal Tier 3 Bin 0, California ZEV, and ILEV standards, clearing a key federal hurdle to legally introduce the car into U.S. commerce on May 29, 2026 .