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Bad gas mileage help

My 04 has a "door", behind the rear seat, under all the trunk carpeting. It's almost directly in front of the spare tire well, but it's got 8 bolts holding it down and appears to be tack welded... unless the factory installed it with sealant goop BEFORE painting the body... lol
 




Have you checked for vacuum leaks? It's kind of odd that your LTFT are so out of wack and no cel.
And how old is the rear o2 I mean, if it is as old as the front one you never know. And to be honest I have no idea if that is normal readings for o2 sensors.
 
Thats kinda what ive been think maybe a vac leak....which should i spray around all the lines and any where else like hidden spots i should try and spray....carb cleaner i think right
 


All i had was maf cleaner. Didnt notice any changes with the idle. The app has a vac pressure widget. Would i get a good reading from that? If so what should it be. Or the fuel pressure gages at the auto store does fuel and vacume i belive.
This is driving me crazy and killing my wallet. I watched pretty much a quarter tank go in two days only driving 25-30 kms
 


i cleaned out my fuel tank in 11' and have put a new fuel filter (wix) on twice since... instantly noticed a difference!!
00" GT stock, still get 20mpg ish in town driving
 
Im not to sure im gunna drop the tank out just yet. I want to order this tester for fuel and vacume. Would this one work OTC 5613 ...on amazon.com. But it only says low fuel pressure on the fuel side of it.
I have this feeling that everytime i start the car ive watched it drop. Does it check high fuel pressure? Or im i sniffing glue sticks.....
And does anybody think that the rumbly starts and some what shaky idles have anything to do with the fuel being eaten up. Also the rumbly shaky when i turn the car off.
 
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