Tesla Semi Specs 2026

Tesla Semi Range — What 500 Miles Actually Means

The Tesla Semi Long Range achieves 500 miles on a single charge at a full 82,000 lb gross combined weight — the maximum legal limit for U.S. freight operations. That's not a light-load figure or a lab result. It's 500 miles hauling real freight at highway speeds. For most regional and long-haul routes, a single charge covers the full trip.

Tesla Semi Charging — The 1.2MW Megacharger

Tesla built a dedicated charging network for the Semi called Megachargers, capable of delivering up to 1.2 megawatts of power. That means the Semi can recover roughly 70% of its charge in about 30 minutes — fast enough to fit within a federally mandated driver rest break. The first public Semi Megacharger opened in Los Angeles in 2026, with more locations planned across major freight corridors.

Tesla Semi vs Diesel — The Economics

A diesel Class 8 truck consumes the energy equivalent of roughly 5.5 kWh per mile. The Tesla Semi averages 1.64 kWh per mile in real-world pilot operations — about three times more efficient. At current electricity rates versus diesel prices, fleet operators are reporting estimated fuel savings of $0.50–$0.65 per mile. Over 500,000 miles of operation, that adds up to over $300,000 in fuel savings per truck.

Key Technical Upgrades on the 2026 Tesla Semi

• Fully electric steering assist for improved driver feel and reduced fatigue
• Cybertruck-derived actuators for added durability and strength
• 48-volt electrical architecture throughout the vehicle
• 4680 battery cells rated for 1 million miles of use
• Camera-based system replacing traditional mirrors
• Drag coefficient of 0.40 Cd — below that of a Bugatti Veyron
• Approximately 1,000 lbs lighter than the previous version