k and n gained me 2 miles a gallon in the geo after i put it in 52 mpg average, plus the old filter needed to be raplaced anyhow , so after 26 gallons i get a free gallon of 3.00$ , so every 1352 miles i get 3.00 back at 13,520 miles i got a free air cleaner, but if it didnt improve your mileage i dunno what to tell ya
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