The tyres that come with the sportpack might give you a bit more rolling resistance but 6.7 seems high for that sort of run. Did you have had a strong headwind or crosswind becasue that can make a surprisingly large difference? In still air conditions my 118 TSI would normally use about 5.5 on a similar run. I've averaged 6.4 l/100m in the nearly 7000km since I bought it and I've got a combination of rubbish traffic and some freeway running.
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