Airfilters mpg

The more air you can get through a filter the cleaner (better MPG) one should get. This is assuming that everything else is working correctly. On a diesel the easier it is to breathe the better the horsepower/mpg. IE larger intakes, larger stacks. That being said is the easy part. Just remember there is alot of "snake oil vendors" out there that would love to sell you something that will tell you to get better mileage yet really may be getting you to do some maintenance (improving your mileage), and depriving you of your money with slogans of how you can save money by buying something.

 

You will not gain anything from a fancy filter. No increase in mileage from air. You will lose mileage from a dirty filter. The engine is made to run with enough air to support combustion and burn all the fuel that was added. Adding more air than is necessary, costs you because it takes power to compress the extra air that is not needed. Adding a large exhaust, besides making you obnoxious, does nothing good. The engine is made to run with a certain back pressure, as long as it does not have high restriction It does not make any difference. Trucks with dual exhaust get the same mileage, as the same truck, with single exhaust. All that fancy pipes and stuff is to make it look good and after someone sells you a thousand dollar exhaust, you thinking it is better is to make you feel better. If you want an air cleaner that is better for mileage, put it under the hood like a Freightliners FL120. They use the same cold box technology as Nascar does getting the boost from the preasure in front of the windshield. When you are driving down the highway, hold you hand out feel the drag, get the air cleaners and the exhaust off the sides of the truck. That will get you better mileage. Just a thought!

 

I run the fleet air filter on my tractor. Same run, same loads, every night.

I'm a fan and here's why. Bottom line...the filter does improve airflow. Your results may vary, as they say.

My tractor gets pretty good mielage to start with. 7 is no big task for my tractor, if I'm trying at all. Usually, I'm a little over 7 in the summer, and in the winter, I am just below 7. That's running under 65, usually 62 or so.

I did see a little improvement in the mileage when I went to the fleet air filter, but it wasn't a huge deal. I could see about 2/10ths, which isn't huge, but noticeable on my dedicated run where everything is same all the time.

Where I really noticed it was that the filter stayed cleaner a whole lot longer. Before I bought the fleet air, I could see a noticeable down turn in fuel economy when the filter was ready to be changed. Now that I have the Fleet Air, if I see a little change in power on the hills, bring the filter home, wash it out, oil it up, and put it back in. I love it. It's very cost effective after a while. The paper media filters for my truck are a few bucks more around here, for some reason.

I do see a noticeable difference in power, though. It's not a huge difference, but in my tractor that I'm used to, on the same runs, on the same roads, pulling the same loads, I can tell. When I start to lose any of the gain, I bring the filter home to clean and re-oil it.

If you are always running different loads under different conditions, it's possible you may not see a difference, but I do. I can show on paper where the filter has saved me money over the year and a half I've had the thing on just the price of filters, and I can see a difference in performance, and a slight difference in the mileage. You are just not going to feel like you're driving a different truck with a newer, more powerful engine.

Overall, I like the thing. It does help, just be realistic about the results you expect. We have a 2003 Ford Diesel Pickup with a K&N filter on it. Same thing, same principle as the fleet air. The results we saw on that is why I bought the fleet air filter. The results on the Ford F-250 4WD were better than the fleet air. The power was VERY noticeable on the pickup and the mileage went up considerably. The difference, in my opinion, is that my '96 Freightliner has an old pre-emmisions engine and the Ford pickup doesn't. I think the gains made up for some of the restrictive EPA bull crap, but that's the only thing I've come up with for the difference in performance in the two trucks.

 

Been running the Fleet air filter about 300 k . no mpg change. improved throttle response and slightly lower silicon levels in oil samples. I would buy another.

 

most of the under hood single air cleaners are really inadequate for anything over 400 hp those trucks are where you will see the biggest difference...if you run 100,000 miles a year at 6mpg a 2/10 mpg increase at $3.00 a gallon would save you $1,700 a year

 

outside filters are better than under the hood air filters ambient air temp will be cooler going in engine. the cooler the air the more air the turbo crams into the motor. it will offset the drag on aerodinamics.

 

I am shure you can look under the hood of a truck with the air cleaners hanging on the outside, look at the length of piping, Which one do you think is going to absorb heat the air filter under the hood gets an actual boost from the preasure wave in front of the windshield, and they draw all the air from outside and have a short one piece rubber connection no resistance, directly into the turbo, compared to a longer smaller plastic pipe with a bunch of connections. There are lost of test data that proves the KNN washable type of filters let in a lot of dirt. Go to the diesel garage site and look it up. Just a thought!

 

I've had a Fleet Air for around 200k. As I run completely irregular routes and weights, I never noticed a fuel mileage difference. That being said, I can go from 7.5 on one run to 5.5 on the next.

The place that I did notice a difference right away was the difference in power. Noticeable response and better acceleration.

The second place that I noticed a difference is in my wallet. I don't have to replace filters anymore. I know, that is an extremely small expense in regards to the big picture, but my way of thinking was, even if I receive no other benefits from the filter it will pay for itself eventually.

This statement is completely false. Imagine you (the engine) are running up a hill. Would you be better off sucking air through a 50 foot garden hose, or a 5 foot clothes dryer hose? More air, specifically oxygen, equals better performance.

The same can be applied to the exhaust, except instead of sucking, you would be blowing. (Insert Joke Here)

 

shorter tubing or not when a air filter is under the hood heat is a factor hot air expands cold air contracts. had a T800 bought new with under hood air filter replaced with vortex filter canisters on the outside had better response increase in mpg simple fact it breathed better.