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Microscopic issue that causes a big difference

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#1
Hello people of the forum world, coming to you guys yet again for help because yall are probably some of the smartest when it comes the the fiesta st. So I recently have been experiencing a huge loss of gas, very noticeable. 100 miles from work to my house to my gals house, about a 20 mile drive total and I try to stay in a reasonable rpm to get good gas mileage but it just doesn’t seem to want to work with me, also experiencing a slow loss of boost as the car warms up and has been driving for a while, tuned for 27. Will hit that mark then after about a couple miles boost only will hold at 25. About to go and fiddle with my intercooler pipes check for any damaged hoses but I have been at this for weeks. The gas gauge also seems to flex different numbers at a stand still rapidly, so these problems correspond with one another?
 


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