I wonder how that guarantee will be realized? Subsidies? Unless I am missing something, this seems to be artificially lower operating costs of the Semi in order to make to favorable to diesel.
This reminds me of car companies advertising guaranteed gas prices for certain types of cars back when gas started hitting $3/$4 mark. I would see commercials of new cars saying $2.50/g for the next 5 years or something similar.
Found one: https://www.caranddriver.com/news/chrysler-extends-gas-card-...
Chrysler, $2.99/g for 3 years if you buy new car.