If you don't know what "pulse and glide" (also known as burn and coast) is, google it. It's a fuel efficiency technique. Works best with hybrid vehicles, but (in theory) is supposed to work with any vehicle.
I decided to test it the last two days on a 25 mile stretch of interstate. My new car has an average MPG display on the dash that resets with the trip odometer. Yesterday and today, I reset the trip at the same spot going the same speed. Both days were at the same time of morning, no traffic and similar weather conditions.
Average speed for P&G and steady were both 70mph.
P&G - 24.7mpg
Steady speed - 28.2mpg
Suck it, hypermilers. That's pretty decisive.
Even if you don't believe the accuracy of my gauge or the numbers associated with it, they were both done the same way with the same instrument.
Also, technically you're supposed to turn off the engine during the "glide," but who in the hell is going to do that? Lol. I just coasted in neutral with the motor idling.