Vibrating at 45+-

If you have ruled out the tires then check out the wheel bearings and the front suspension and steering rack. It could be out of alignment or have worn suspension parts.

Jaybird317- hey, sorry to hear all this. As a last resort, why not let the Subaru dealership take a look at your car. Couple of questions for you; how many miles are on the car, I imagine that your engine, transmission and head gaskets are all fine? What's your overall fuel mileage in the city?

If not tire/wheel balance nor a bent wheel (since you've rotated with out change), AND BJs and TREs are not sloppy, I'll go with an aging axle. You can try squeezing grease back into the "big end" at each end. If no change try to have the axles "watched" for visible vibration when driving carefully while on a secure lift. It's more likely to be an axle than a center driveshaft or wheel bearing. Indeed, if you've replaced a CV/halfshaft you may have gotten one with insufficient grease or tightness. Usually they will NOT "wear in", and require swapping in another axle. Good luck.