Last year, two Tesla Semi customers got closer to what Musk claimed in 2022. DHL got 1.72 kWh per mile in their own test, and Saia got 1.73 kWh per mile. Now, Tesla Semi appears to have improved quite a bit in a new real-world test by logistics company ArcBest. The company claims to have put Tesla Semi through regular operations, varying from lane dispatch to regional runs over three weeks: Over a three-week period, ABF operated a Tesla Semi across typical dispatch lanes, including over-the-road routes between service centers in Reno, Nevada and Sacramento, California. The pilot also included regional runs in the Bay Area and rail shuttle operations. ArcBest claims that Tesla Semi averaged 1.55 kWh per mile during the three weeks: The electric Semi logged 4,494 miles, averaging 321 miles per day with an overall energy efficiency of 1.55 kWh per mile. Efficiency in the trucking business varies considerably based on several factors, including the load, but it is nonetheless an impressive performance. Top comment by Luke