DHL says that it was able to confirm that the Tesla Semi is capable of 500 miles on a single charge with a full load.
But more importantly, DHL confirmed that it achieved an efficiency of 1.72 kWh/mile on average during its two-week trial:
During the trial, the trial vehicle averaged 1.72 kWh/mile operating at speeds exceeding 50 mph (80 km/h) on average for over half its time on the road. The result exceeded our expectations and even Tesla’s own rating. That’s exactly what Tesla has been predicting, and in fact, Tesla says that it now does a little better with 1.6 kWh per mile.
kWh per mile means that this is the amount of energy it needs to travel a mile. Considering that 1.7 kWh of electricity can cost as low as $0.15, it opens up the opportunity to greatly reduced the cost of operation of semi trucks.
For everyone interested in the topic there is an English version of a German electric trucking channel: https://youtube.com/@electrictrucker.
TLDR; Every major truck company has an electric truck for sale, they have the same daily range in Europe and are significantly cheaper to operate.
He is a startup found turned truck driver who does weekly vlogs about his work and gives good insights about the current state of electric trucking in Europe. At the moment every large trucking company (not just Tesla) have electric trucks on sale and the company he is working for bought quite a few from different companies. He gets day ranges of 750km with the right traffic conditions and also just charges in his 45min breaks which you have to take every 3.5h I believe. Also the daily driving is limited to 10h and the maximum speed limit is 80 kph, so the theoretical maximum range of a single driver truck in Europe is a little bit above 800km. That puts electric truck right now on par with diesel trucks, because you cant always drive the at the maximum speed limit. Also he calculated once that electric trucks are roughly 30% cheeper.