Dont be disappointed in not having that chip, I would be happy. It probably means that your engine has not been flogged to death by a wannabe f1 driver. Its not as if the trucks are snails anyway.
All TonyC tells you will be sensible, controlled and fuel efficient, based on his personal experience and testing, not from someone who has a mate down the pub who thinks he has read a book he found on a bus, - you won't get better advice !