Yeah hypermiling and performance aren't completely unrelated...
But to further your own knowledge on driving style v efficiency, read this article NOW. Not later.
Autospeed Brake Specific Fuel Consumption
After realising this I typically accelerate at high loads and use the gears to vary my acceleration. This puts the engine load (and efficiency) measurably higher than varying throttle to change acceleration.
Another thing that you will want to learn about is injector cut-off. It's when the fuel is shut off completely on zero throttle and taking full advantage of it can alter fuel economy markedly when coasting. It also promotes coasting before lights as you automatically think "injector cut = infinite mileage while slowing, so I'll back of earlier and get a free 50 yards at every single light"
If you don't have any fuel consumption display you can still discover it. Start at about 3000rpm and back off the gas pedal completely. When you feel the engine braking drop suddenly it means the injectors are opening again and you are using fuel. Above that point, zero throttle means zero fuel. This point can vary with coolant temperature and air conditioner usage, but is typically 1500rpm (my '13 Suzuki Swift is 1100rpm with a/c off, 1500rpm on).
Just those two techniques (which don't actually impede progress at all) are the difference between me and my stepfather driving in traffic. He got 7l/100km indicated driving my car, I got 5.5 on the same loop