Keeping the rpm low,
Early gear shifting up when not accelerating,
A light foot on the pedal,
Least braking,
Proper tire inflation,
Lower grade engine oil,
Non-locking brakes (when brakes are not applied),
Avaioding extra clutch slipping (full-engaging at lowest rpm),
Drafting behind a larger vehicle on long ruotes...
are the key factors of hyper miling. Just google it.