I've had the filter in for a while now and my MPG have not increased. As far as not being to able to notice a difference with just the filter change I strongly disagree. If people are claiming that they notice a difference with larger throttle bodies, Tornado inserts or throttle body spacers on otherwise stock vehicles then why not see a difference with a new filter. Yes the same amount of air is going into the stock air intake but it's not being restricted as much by the filter. If you took the filter out of the airbox I promise you would see more air getting into the engine with the stock intake setup.
I can't say if my acceleration is better or not but I said that the throttle response is better and the engine runs smoother.
I've run Amsoil filters in every vehicle I've owned since 1993 and this is the only vehicle I noticed a difference in with just the filter change. All of the other vehicles got a free flowing exhaust at some time and not until I had both the filter and the exhaust did I notice a difference.
I have had a K&N filter in the past on a 1991 Jeep that I noticed dirt building up on the butterfly of the throttle body. Before the K&N I ran paper filters and didn't have this problem. I switched from the K&N to Amsoil and cleaned the butterfly then never had the problem again.

 

When I was referring to not being able to feel immediate throttle response, I was referring to 'just adding the filter alone.' yes, of course if you remove the filter completly you will feel something. Yes, there will be different effects with 'tornado's and whatever, but those are not air filters. Staying on subject of air filters (not throttle body spacers, tornados, and everything else under the moon) I don't see how you will immediately feel the power by freeing up 1, possibly two ponies on a vehicle that make close to 300 as it is.

Yes I know K&N advertises "up to 15HP gains", and that the Amsoil filter probably has a similiar claim. But come one, that would be like a 100% HP increase if you slapped it on a Model A! I saw a dyno of a Mustang to test air filter claims, and they only freed up around 1 pony, and the testers said that was iffy because it could have just been the fact that it was a newer filter, and less restricted.

I suppose aftermarket air filters do have advantages. They look pretty, you just have to oil them instead of changing, and there are probably some more out there.

 

I never claimed to get more HP. I have no idea if it did. I just said it was snappier and smoother.

 

The difference in air flow between different filters is small compared to total air flow, even so with no air filter at all. There is an interesting link I read on the subject, I think this is the one.


Air filter shoot - out

 

The mpg I quoted was before the amsoil air filter and it dosn't matter if you believe it or not I am just telling you what the truck did. I have amsoil in the motor,trans and diff.

 

I get 14mpg city and 16 highway which is probably close to the average I have seen on this board. I drive 80 mph on the highway so maybe if I slowed down I could get a little better, but then I would get run over here in Texas.