Originally Posted by SWS
My experience in my 2006 Accord V6 (detailed above) was light-throttle around-town driving for about 3 months -> puzzling loss of power in any weather, with very noticeable power improvement (like new) immediately upon changing the air filter only.

A new filter might have improved throttle response down low - ie, more even/smoother air flow going into the engine at light throttle.