Hey Alexander,
I've seen your GTi on the AX club forum am I right? I used to drive an AX 1.1i until it broke down, got a Peugeot 106 1.1i now
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Love those little AX diesels, they are hard to find nowadays. Try to stay under 100-110 km/h, above those speeds the fuel consumption raises dramaticly in my opinion.
Good luck with your eco-driving and I would love to see pictures of your AX diesel
Greetings, Sjoegerd