Review on K&N Engine Air Filter: High Performance Replacement for 2017-2019 Hyundai/Kia L3/L4 Models, Washable & Premium Filter (Elanta, i30, Kona, Veloster, Cee d, Forte), 33-5050 by Kyle Merriman

I did an unannounced filter test. Here are the dates: Hyundai Elantra 2.0 2018. I drove from ELP to San Antonio 1350 miles round trip. With the stock filter / before the K&N filter was installed, I averaged 37.1mpg. After installing I get 41.3. It was on the highway up to 80 km/h and in the city including hilly driving on the highway. Get 4.2mpg. Old MPG I'd spend 109.16 at K&N, spend about $98, averaging about $3.00 a gallon. Or saved about $11. Redeems itself.