Installed this on an old 2003 Hyundai accent GL 1.6L, to replace the crappy stock air filter.
Noticed a huge performance increase of torque, vs the old stock air filter.
I am unsure of any (mileage) advantages yet, as I only installed it yesterday. However, i'm quite satisfied and I didn't buy it for the mileage advantages, just wanted to tidy up the under the hood looks.
Highly recommend this product.
Calgary, Alberta, Canada