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.
![](https://images.spritmonitor.de/544051_25.png) lifetime FE over 0.2 Gigameter or 0.13 Megamile.
![](https://ecomodder.com/forum/fe-graphs/sig7127a.png)
For confirmation go to people just like you.
For education go to people unlike yourself.
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