Logistics provider ArcBest Corp. has completed a three-week pilot using Tesla Inc.’s electric Class 8 Semi, logging 4,494 miles and averaging 321 miles per day. The truck consumed 1.55 kWh of electricity per mile, the most efficient real-world figure yet reported for the model. The result surpasses Tesla’s own fleet average of 1.6 kWh per mile disclosed in September 2024 and represents roughly a 10 percent improvement on third-party tests conducted in 2023. Higher efficiency lowers operating costs and extends driving range, key factors in the economics of battery-electric freight hauling. Tesla says it plans to begin volume production of the Semi at a new Nevada factory later this year, with initial customer deliveries expected in 2026. Improved performance could strengthen the company’s pitch to carriers seeking to cut fuel expenses and curb greenhouse-gas emissions from long-haul trucking.