I'm also getting pretty bad MPG. I do have quite a led foot, but when I got the car I was averaging 17-20mpg on setting 2 on the trip computer. Now it's 14-16mpg. Could this be caused from clogged PCV? I still never replaced the coolant temp sensor but when my step dad fixes my PCV I'll have him do that as well. I don't know if it's bad, but the dealer told me it should be replaced. On the parkway if in going 75-80 in getting 20-22.5mpg and in the city forget it. Like 10-14mpg. I barely get 200 miles out of one tank.
So all in all my car has pretty much had a total overhaul from day one.
Alternator
Timing belt
Fan clutch and pulley
Serpentine belt
Both flex pipes
Fuel filter change
Air filter change
Cabin air filter change
Coolant flush and getting another one
Spark plugs 10k miles ago
Most vacuum lines replaced. A few I can't get to though.
So I don't understand how after doing all of that my MPG is just dropping. I always fill it with premium 92/93 octane depending on where I go. I've added techron a couple times over these past 10 thousand miles. Could that have clogged my fuel filter? Any other suggestions to try and get my MPG back up besides replacing all the PCV hoses? I also noticed that my mpg stays stuck at 3.6mpg for 30-60 seconds when I first drive my car.