What do "pulse and glide" and the "warp stealth" mean here?

For the first mile or two out of the driveway my husband explains the importance of "good glide", also known as "feathering the throttle from full release." The critical thing here is keeping your speed under forty-two miles an hour. But that's just the beginning. His new Internet buddies have shared other gas-saving techniques like the"pulse and glide" and the "warp stealth." I'm thrilled.

What do "pulse and glide" and the "warp stealth" mean here?