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You can believe what you want. I'm just stating what I read last fall, of which, was also published in a major automotive magazine (C&D I believe it was). Besides, the DOE doesn't apply where I live, USA only. Canada has similar tests but mileage is different as L/100km is more precise than MPG. The EPA should apply a GAL/100miles instead, as it would be more precise than MPG, but since people don't like change, I doubt that would happen unless the country votes on it.
If you take a towel, roll it up and stuff it into your air box, I guarantee that your mileage will plummet, if the vehicle can even hold idle. Yes, a towel is essentially thicker than your average air filter cellulose material. I used one on my '04 Jeep Wrangler when my airbox broke off (snorkel type), did a great job of keeping crap out, but mileage was terrible - lucky to get 14mpg on the highway staying under 90km/h. At that speed I get close to 20 with a higher flow unit installed. I'm sure vehicle tuning also plays a role in air movement as well, but that's another story.
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'00 Durango R/T - 183,000kms (will replace with a 2.7L I4 Highlander shortly)
'99 Taurus SE sedan - 204,500kms
'06 Pontiac G6 GT - 42,000kms
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