For the first question, I average 12.4-12.8 km/l on a 2004 Mitsubishi Adventure diesel, using biodiesel as fuel. Lately though, I've been consuming 11.8 km/l on my last two trips to the pump. I attribute this to a slight issue with my vehicle's present aerodynamics.
For the third question, yes, gas-saving devices are for real. That is, for real suckers. :D


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