For about the last for months my gas mileage has been crap 24 to 25 it was 30 to 31 with half highway half city and some occasional spirtied driving still had power good tune up always maintain oil, plugs, wires, cap, rotor, etc etc. For a while I thought the coil was taking a dump tested it and it was fine about a month and a half ago I did the h series upper plenium swap had stronger power to redline 
but same gas milage now here comes the missing piece of the puzzle. Ive always had a little oil in the spark plug tubes and always figured it was the upper valve cover gasket as usual but then got to thinking about the lower tube seals so this weekend decided to replace them went to honda and and picked up the four lower tube seals and a new cam seal figured since I was going to be in there should probably go ahead and change that to. They were SHOT hard as a rock one was even stuck to the head fixed it all and replaced the cam seal good thing I bought it to mine was trash. Then got to thinking every time I would change my plugs all of the oil that would be setting in the spark plug tube would fall in the clyinder I would usualy run a rug down there to clean it up but I was only getting what was left so oil in cylinder new spark plug in fire it up and bam oil burns to new spark plug instantly craping it out this time I sprayed carb cleaner down there twice to clean it up put every thing back together and wow so much more power I loved the intake swap before now I cant live without it. Also before around 200 miles Id be at half a tank im at 170 and havent droped below 1/4 of a tank 
good deal swap them tube seals. Im sorry this was so long I just had so much I wanted to share If you havent replaced them and yoiu have oil in the tube I would say do youll be happy you did I hope this helps those people who are getting bad gas mileage. THANKS
but same gas milage now here comes the missing piece of the puzzle. Ive always had a little oil in the spark plug tubes and always figured it was the upper valve cover gasket as usual but then got to thinking about the lower tube seals so this weekend decided to replace them went to honda and and picked up the four lower tube seals and a new cam seal figured since I was going to be in there should probably go ahead and change that to. They were SHOT hard as a rock one was even stuck to the head fixed it all and replaced the cam seal good thing I bought it to mine was trash. Then got to thinking every time I would change my plugs all of the oil that would be setting in the spark plug tube would fall in the clyinder I would usualy run a rug down there to clean it up but I was only getting what was left so oil in cylinder new spark plug in fire it up and bam oil burns to new spark plug instantly craping it out this time I sprayed carb cleaner down there twice to clean it up put every thing back together and wow so much more power I loved the intake swap before now I cant live without it. Also before around 200 miles Id be at half a tank im at 170 and havent droped below 1/4 of a tank good deal swap them tube seals. Im sorry this was so long I just had so much I wanted to share If you havent replaced them and yoiu have oil in the tube I would say do youll be happy you did I hope this helps those people who are getting bad gas mileage. THANKS
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