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I'm going to echo people talking about your cruising speeds. 138km/h you are going to see less fuel economy than the rating which is normally taken at about 90-100km/h.
Gearing and wind resistance are big factors. The Honda Fit we have will do 5.3L/100km at 105km/h but jump to 6.5L/100km or more if you cruise at 120km/h on the same road.
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