pastduebill
Member
2015 Jetta TDI manual trans.
My question is about a slight MPG reduction after dropping in a K & N air filter. Can anyone technically explain how a filter with LESS restriction would reduce MPG?
Have used K&N for decades on vehicles (motorcycles, pickups, cars - gas and diesel) with improved MPG/performance on all of them. With no codes or MAF sensor problems ever. I don't understand why anyone would slop enough oil on it to drown the MAF sensor anyway, but that's a different topic.
Is the ECM 'programmed' for the exact restriction of the OEM filter?
Would appreciate a technical answer for this.
Thanks,
Bill
My question is about a slight MPG reduction after dropping in a K & N air filter. Can anyone technically explain how a filter with LESS restriction would reduce MPG?
Have used K&N for decades on vehicles (motorcycles, pickups, cars - gas and diesel) with improved MPG/performance on all of them. With no codes or MAF sensor problems ever. I don't understand why anyone would slop enough oil on it to drown the MAF sensor anyway, but that's a different topic.
Is the ECM 'programmed' for the exact restriction of the OEM filter?
Would appreciate a technical answer for this.
Thanks,
Bill