33% reduction in mileage?

[Squishy]

I wanted to post some experience on here that could potentially help someone here. My previous car was a 5spd Scion xB, of course it was also 1nzfe powered. At around 50k miles my fuel mileage nose dived from 30-32 to 21-22. and it wasn't a fluke, it lasted for 6 months. I took a 6 hour trip to Dallas and 22 was all it would muster. I tried a tune up and it did nothing (btw if you haven't figured it out yet stay away from e3's). I had no check engine lights and no warnings signs, I mean the car was still running great. So I went to work for O'Reillys and one day we got to talking about the issue I was having. One of the guys suggested I try Seafoam. I used the throttle body cleaner that uses a curved nozzle to spray into the intake while its running and I put a bottle in the tank. Instantly it jumped back to 29mpg and averaged 27-28. for the next 2 years and 30k miles of ownership. I did add a can of Seafoam every other oil change. Also don't panic if you run Seafoam through the intake in this way and it looks like you blew a set of rings...lol this is normal. However you should have seen my face when I did this to mine without that little tid bit of knowledge.....lol PRICELESS!