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Ford Mustang Questions

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Almost sounds like wheel bearings, but jacked up front end and spun tires around, not bearings. driveshaft? Serpentine belt?
Addition, it also says OBD2 MONITORS NOT READY, and under that, it says CATALYST, EVAPORATIVE SYSTEM, and SECONDARY AIR SYSTEM. However, on the first part of the smog check under VISUAL INSPECTION RESULT INFORMATION, the only thing that FAILED was the VACUM LINES to SENSORS/ SWITCHES. So if I fix that problem then shouldn't it be READY!!.One more thing this happened today roughly at 4:00 pm, at a STAR SMOG CENTER IN NORTH HOLLYWOOD, CA. Please help with any information you can provide.
Thank you
I heard loud knocking sound coming from my engine and was told it could be the front timing chain.
Hi I bought a brand mustang ecoboost premium on may 27 2016. Its so painful when your car gets into issues within such a minimum time and miles on it.
issue 1: yesterday I had my tank almost empty. the dashboard said 6 miles to empty. I stopped at a gas station and started filling my gas. the pump turned off after 12.5 gallons. generally I remember filling up untill 14.5 to 15 gallons of gas. not sure where the room for another 2-3 gallons has gone!! I spoke with a friend who drives a mustang ecoboost '16 and he said his tank may go till 16 gallons at times. I checked the range as well. its showing as 275 miles which earlier used to show me somewhere close to 315 miles. Also I feel like the arrow on the gas gauge is below the F (which is supposed to be a little further to F)
issue 2: I feel like the performance of my car is going down and not as it was before. My friend who is been driving with me initially for around 3 months took a long pause and resumed travelling with me recently and he said he hear some weird sound with the engine.
issue 3: I hear some sound when I apply breaks as well.
issue 3: The gas mileage is getting bad day by day I dont know why. initially I was driving real fast and slamming the throttle all the time. But when I spoke with a friend he said I need to tune the engine initially for better performance. That is when I started driving the car subtly. I remember seeing figures like 24.5 to 26 in the city but now a days I see gas which is hardly getting close to 22. wanna let you know that I put regular gas and not premium.

Can someone kindly read my long post and please answer the questions. Thank you so much.
Scan tools tell me there are no dtc's in computer, but when obd 2 monitor tests are run I keep getting catalyst incomplete after doing all of the ford specific drive cycle requirements, car is running really bad, I have some kinda vaccum leak because with the car at idle when I barely press the accelerator I hear a whistle sound as if someone was sucking in air to whistle, I just replaced all of the 4 oxygen sensors because the upstream o2 sensors failed min. low voltage tests, and there was a loud buzzing sound under car which I found was the o2 sensors, now the 2 upstream are buzzing again and the cat by drivers side is making a weird humming noise
Scan tools tell me there are no dtc's in computer, but when obd 2 monitor tests are run I keep getting catalyst incomplete after doing all of the ford specific drive cycle requirements, car is running really bad, I have some kinda vaccum leak because with the car at idle when I barely press the accelerator I hear a whistle sound as if someone was sucking in air to whistle, I just replaced all of the 4 oxygen sensors because the upstream o2 sensors failed min. low voltage tests, and there was a loud buzzing sound under car which I found was the o2 sensors, now the 2 upstream are buzzing again and the cat by drivers side is making a weird humming noise
When this happened, the car lost power as if it wasn't getting any gas and I had to stop and restart the car. Then the light turned off.
Motor was just warmed up enough, redline it through the 3 gears, up until 4th,I heard clunky noise then tons of smoke came under the hood and exhaust. Engine oil totally leaked out, no mark on the dip stick. The smoke smells like burning clutch. Car can only start up for 3 seconds then dies out. A blown engine?
No codes have appeared yet
Do I need to replace the timing belt?
Oil level is also low
The needle on the fule guage of my wife's mustang has flipped around and now points to the opposite side of the full/empty bars.
When I get up to about 45-50 miles an hour I get a violent shaking and I get a loud "slapping" noise from what sounds like my exhaust. I've changed my oil, and oil filter. I am not sure if that helps the problem at hand. I don't think it does. Anyway I plan on changing the fuel filter to see if that does anything. Any help is greatly appreciated. Thank you!
When I start the car the needle moves backwards then forward. By moving backwards that becomes the new empty indication. After about ten starts when I turn they key off the needle is pointing straight down indicating empty when it moves forward it stops E indicating full. I replaced the stepper motor still the same results. The needle moves backwards two needle widths every start. Any ideas?
Grinds with clutch all the way in if the engine is spinning past 2100 fps
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