18 wheelers get about 5 to 6 mpg, with a us gallon being 3.785 liters (corrected) . Each mile thus is 0.63 or more liters of diesel. A truck can do at least 10

18 wheelers get about 5 to 6 mpg, with a us gallon being 3.785 liters (corrected) . Each mile thus is 0.63 or more liters of diesel. A truck can do at least 100k to 120k miles per year. So 63k to ~76k liters per year per truck. 63k * 2.6kg equals about 163.6 metric tons per year on the low end.