Worse MPG with K&N drop ins?

Abdiel

switch back to your original filters (without ECU reset) and see if the mpg changes.

if mpg stays the same even with your original filters, it could be that the ECU is keeping a/f on the rich side for safety while it relearns (just a guess).

Maila87

It was first thing, what I thought about.
HPS tubes are ordered, so we'll see if it make some difference.

VQ are grass eating beast, but sometimes you have to cruise and in this situations I check MPG

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-->2005-6 Nissan Micra 1,3i CVT 72PS Red MY 98 -->2006-8 Nissan Almera 1,5i N16 96PS Red -->2007-8 Skoda Fabia Combi 1,2HTP 3 cylinder 60PS Green -->2008-11 AUDI TT 2,0TFSI FWD S-tronic 200PS Red MY06 -->2011 Nissan 370Z manual White Pearl