13 mpg semi

dodge guy wrote:
That's also best case scenario. I'm sure it's only at 55 or 65mph. Not driving like a crazy person. And treating the equipment with a little respect! Now give it to the trucker that has to "get there now" and I'm sure that 13mpg is history.

This^^ -best case-
compond engines have a incredibly narrow band where they are most economical ,I think Detroit uses compounding already.