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I can imagine how he (probably) really saw an improvement just after fitting the K&N filter in an A-B test situation.
I had a proper test situation today driving the same route twice: dropping my wife and stuff off at the flea market, then picking her up again with 95% of the stuff we brought.
First trip: 6.0 l/100 km (for about 10 km of city driving)
Second trip: 5.4 l/100 km. About 11% better.
Same driving style, very much the same conditions. But the engine was still a bit warm. And then there's the hybrid system with a mind of its own; heavy regen in the first trip.
A single A-B test gain will not cut it.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gmeter or 0.13 Mmile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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