Dirty air filters don't affect MPG: Consumer Reports

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Dirty air filters don't affect MPG: Consumer Reports - 2/6/2008 4:48:56 AM    HankL   Posts: 2718 Joined: 8/20/2005 Status: offline I bet you have read a hundred times or more that a dirty air filter reduces MPG.... Recently both Hot Rod Magazine's technical guru Marlan Davis in his 'Pitt Stop' advice column, and now Consumer Reports in actual real world tests correctly state that on a modern EFI engine dirty air filters don't affect MPG unless they are super-severely plugged up: http://www.consumerreports.org/cro/cars/tires-auto-parts/car-maintenance/get-the-most-mileage-for-your-fuel-dollars-406/index.htm sample quote: According to our tests, driving with a dirty air filter in modern engines doesn't have a significant impact on fuel economy, as it did with older engines. While fuel economy didn't change, however, power output did. Both cars accelerated much more slowly with a dirty air cleaner. We drove both vehicles with their air cleaners restricted and found little difference in gas mileage with either engine. That's because modern engines use computers to precisely control the air/fuel ratio, depending on the amount of air coming in through the filter. Reducing airflow, therefore, caused the engines to automatically reduce the amount of fuel being used. Post #: 1

RE: Dirty air filters don't affect MPG: Consumer Reports - 3/26/2008 7:52:03 PM    98DodgeRam1500 Posts: 472 Joined: 1/1/2008 Status: offline great info. It made me reconsider getting a CAI.  There was one listed on craigslist for less than half, new in box, but if its not going to help mpgs, then i don't need it. _____________________________ (in reply to HankL) Post #: 2

RE: Dirty air filters don't affect MPG: Consumer Reports - 3/27/2008 2:50:58 AM    HankL   Posts: 2718 Joined: 8/20/2005 Status: offline since it is always better to test for yourself doubters should consider a test where they tape off part of their filter and do a careful test...like with two trucks convoy style if you don't wish to tape off a working filter consider using a heavily clogged used one like a dealership might give you if asked (in reply to 98DodgeRam1500) Post #: 3

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