I have added Seafoam to the gas tank and got fair results. I just added one can and filled up the first time. I also keep topping off tank before it was through. I did it again after I noticed my MPG's going back down, and this time I just added one can 5to tank and drove it to 1/4 tank then filled up. I got back to the higher MPG's this time but I read this thread and I have dumped two cans this time and filled up I will let this tank go all the way to the low fuel light. I think 3 gal. left. Then I will try dumping into engine like your photo's show and give a foillow up report. Seafoam here is $5.99 a can. Not too bad compaired to what I have seen. TJ