little update, got my first tank done with the cap on. i averaged 8,1 l/100 km (29 mpg), wich is the verry best i have ever done. my previous record without a cap was 8,5l.(27.5 mpg) but its safer to say i was closer to 26 mpg on average.
it's not a spectacular increase in FE as i was hoping to reach the 7 liter limit, but i guess it can be explained that the cap's efficiency is multiplied greatly with speed. and i never exceed 90 km/h on highway (56 mph) so i must already be driving too efficiently for the cap to make a huge difference.
anyway i e-mailed nissan belgium yesterday to make sure my pickup is ODB2 compatible (it has the adapter, but its not certain to be compatible as its a 2000 model) so i can finally get a scangauge. i think that i need it to increase my mpg further, because i think i may be driving too softly and in too high gears wich could pull down my FE i heard.
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