Hmm, tips for economical driving...
1. Don't idle the car unnecessarily
2. Accelerate smoothly i.e. don't apply 100% throttle. Feather it just enough to make decent progress. If you feel you need to make quicker progress, use more of the rev range before applying full throttle. I.e. instead of full throttle and going 2000-3000rpm, use less throttle and go 3000-4000rpm.
3. Anticipate the road ahead. Slow for traffic lights before you have to, slow for roundabouts and begin checking way before you are at the point of leaving. Use the transmission to slow rather than the brakes.
4. Avoid braking at high speed altogether - let go of the throttle instead. You'll find that braking because the car in front does will result in you ending up slower than you need to be, and then having to speed up again. Let go of the throttle and the slower rate of deceleration will enable you to match speed to the vehicle in front more accurately.
5. Leave a greater distance between you and the car in front, both in order to support 4. and to enable you to react "better". By "better" I mean, car in front of you slows for no reason, you can mirror-signal-maneuver and overtake before you have to adjust your road speed at all. If you are 2 feet from their bumper you'll have to slow before overtaking.
6. Don't coast i.e. don't take the car out of gear or leave the clutch pedal pushed in when moving. If you remain in-gear and do not apply the throttle, the car will not use any fuel, but if you coast it will use a small amount of fuel. Aside from that, the reduced degree of control when coasting will likely result in uneconomical decisions.
7. When driving use the gear that most closely matches 2000 rpm, with a preference for a little below 2000 rpm when cruising. If one gear results in 2500 rpm and the next 1800 rpm, choose the latter gear. If one gear results in 2200 rpm and again 1800 rpm, choose 1800 rpm. At high speed cruising on the motorway use the highest gear possible, but shift down if you need to accelerate at all quickly and the revs drop below 1500 rpm.