A smooth style of driving is far more important than worrying about what revs you're changing up at. To put it into context, I worked it out that I get between 38 and 40mpg from my 1.3, and I accelerate briskly up to speed using the full rev range, where appropriate.
If I was passengering with you and you started coasting in an effort to save fuel, you'd be feeling a draught and wondering why the interior light's come on. For one thing, you're simply not in full control, and for another, it uses more fuel to keep the engine idling in neutral than it does for it do be rolling along in gear with no throttle.
Anticipation is key - as a far better driver than me taught me - don't join the queue ahead, start a new one. Basically, if you can see cars backed up at a RAB (roundabout) or traffic light, ease off the gas nice and early, not to #### off drivers behind, but early enough that you only need to brake gently to a halt, or even a nice smooth change into the correct gear, and you can often go through without even stopping.
For open road drivng, I'm not a fan of the clog-and-anchor approach - I'm big on passenger comfort, and that doesn't go with tyre-squealing starts and last minute braking. Yet again, it's all anticipation. Plan where you're going to need to have the car at the correct speed, in the correct gear, balanced on the throttle before you start to turn into the curve.
Then plan it backwards, taking a couple of seconds for a nice smooth gearchange typically means you need the length of an articulated lorry to take the gear - so a lorry's length before the corner, you need to have finished adjusting your speed.
If you can adjust it just with acceleration sense - easing off the power early, rather than braking - then you'll use less fuel than hammering up to the corner and stamping on the brakes.
[If it's a larger change in speed - e.g. into a sharper bend, then again, plan it early, but gently take up the slack with the brakes, then slow the car with firm braking. Don't change down the box, 4-3-2 style, doing so wastes fuel, wears the clutch (more expensive and trickier to replace than brakes), and destabilises the car more than is necessary. Again, take the gear in the pre-planned spot, while travelling that lorry-length.]
Coming out of the bend, increase the pressure on the throttle as the road straightens out - squeeze it in slowly rather than stamping on it. Again, keeps the car stable, the drive smooth, and uses less fuel.
Try ot keep the revs below about 3-3.5k until the engine is up to temp - it saves wear on the engine, and again saves you fuel.
To emphasise it, the main things are anticipation and smoothness. Handily, these go hand in hand with safety, and making good progress. Yes, I am a true, true driving enthusiast. Might sound very clinical, but it's helped me keep it shiny side up while blowing much more exotic machinery into the weeds, for three and a bit years now...
as you don't have full control of your car. But its like, who's gonna know 
