So....a few years ago, I placed a big order on Rock Auto for some maintenance items (oil filters, air filters, cabin filters etc.) Here I'm thinking whether or not I changed the air filter on the Corolla. I was 100% confident that I did.
I noticed throttle response and general fuel economy has taken a nose dive, and I'm thinking WTF. I go and check the air filter to find that the original Toyota filter is still there, and visibly, "looks" okay, and here I'm going WTF?? I go check my parts bin and low and behold, I never changed the filter and do so right away. Turns out I only changed the cabin filter. New air filter made an immediate difference. We did a day trip to Buffalo, NY yesterday, and average fuel economy improved drastically.
For you masochists (ahem BMW guys) I was hoping for a check engine light but no bueno. Stupid Toyota.
