> hows does this compare to gas range on current new rigs?
It doesn't come close. Most semis load 250~300gal diesel and have a fuel economy of 5 to 8mpg[0] so you're probably looking at at least 1000 miles, and possibly > double that depending on the exact model, trip and driving style.
[0] though recent full-aero tractors can reach the low 10s, Volvo advertises 12MPG on their most efficient models
It doesn't come close. Most semis load 250~300gal diesel and have a fuel economy of 5 to 8mpg[0] so you're probably looking at at least 1000 miles, and possibly > double that depending on the exact model, trip and driving style.
[0] though recent full-aero tractors can reach the low 10s, Volvo advertises 12MPG on their most efficient models