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I have a similar car, Skoda Fabia 1.4 tdi. At least, similar in that it's a small diesel car. I have found that P+G does not give good fuel economy, nor does accelerating hard (the 80% load mentioned above).
I get best results keeping the rpm low, I rarely go above 2000rpm.
Your car already has one of the best fuel economy mods- the radiator shutters.
Try increasing tyre pressure.
Use any hills to your advantage: I let the speed drop slightly going uphill, and coast down to accelerate again. I do this as aggressively as the traffic allows.
I get 4.3 l/100km average- over some years. Occasionally, in hot weather, I have seen 3.0l/100km!
Good luck!
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