Gas mileage on 3rd Gen dropped after Air Filter Change

I just replaced my air filter, made sure everything was seated, I was averaging 17.5 or higher, now it's 16.0, what the heck is up with that? Anyone else have this issue? It's a Fram Filter/Xtra guard

 

What filter did you have on before the Fram?

 

Toyota's Filter

 

How many miles have you driven since the change?

 

Only a couple hundred, it's early I know, but it showed up immediately after the change, I've used Fram filters exclusively for years, on my 2nd gen, never seen this happen.

 

Oops my old truck was a 1st gen not 2nd

 

Could just be the MAF sensor adjusting?? I’d imagine it will come back up after more miles

 

Thanks for the reply, I hope it does!

 

My guess -- just a winter gas timing issue.

 

You can always throw the stock filter back in to see if there is any change.

 

Any updates? I just ran into this about 2 weeks ago and I'm puzzled. Truck has 10k on it and gas mileage took a dump.

 

Any chance you left a cleaning rag in the box...?? Hey, I bet somebody has done that.. hehe

 

I'm thinking it's just as someone replied to me, the MAF sensor is learning, mine has came back up some, just not back to normal yet?

 

What filter did you install? OEM or aftermarket?