Crappy mileage-Hi flow filter

[woodjeep]

My new stroker...about 10K on the 92 rebuilt to a 96 stroked to ..4.7 normally gets 15 mpg pretty consistently. I recently put in a Spectrum..Hi flow- oiled type air filter similar to the K&N. It was a stock sized filter that fits into the stock Air box. My mileage almost instantly dropped to around 13-14 at best. My driving habits remained the same mostly highway with a little around town. I have a vacume gauge and the numbers appeared very similar. I probably went thru about 10 fillups all with the similar-reduced mileage...put a new stock type air filter back in and the next fillup was back to around 15 and it remains about that. Very disappointed..thought it would work the other way. I almost never exceed 3000 rpm so I can't believe I am leaning out the stock cleaner..causing better mileage. No appreciable power differences, but the mileage dropped almost instantly..no clue as to why...anyone else with similar issues?..Thanks

[grainofsalt]

It could be an over oiled air filter. I run the paper stock ones, After I count what my time is worth it is the better choice.

[woodjeep]

Thanks...it was new from the box and *pre-oiled* by them...I will clean it and try again in the spring and see what happens. I don't race or run the engine past 3000 so I am probably not taxing the limits of the paper one ..just curious on why it sucked