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The window is usually pretty easy to fix once you take it apart and look at it.
If it just jumps off track and rolls up crooked then the roll up mechanism just needs taken out and straightened. The long channel in it will usually bend open and let the window jump track. Just take the crank assembly out and you will see the track. Just bend it back nice and square, grease it up and it should work fine. Just a tiny bend is enough to make it jump track.
If it is just not working at all then you will probably need to find a mechanism out of another car and swap it in. Just make sure you straighten the track while it is out.
As far as the dragging brake, you would be surprised how much that will actually drop your mileage depending on how much it is dragging. As the car is coasting to a stop it should feel like a bicycle and roll really free. If it feels like it comes to a stop like a normal car then it is dragging somewhere and can cause it to drop a few mpg. It would be a good idea to take the parking brake cable off the car and soak it in something to get it moving good again. They are easy to get out, just look under the parking brake cover trim and you will see how it comes out. It might just be a matter of it is not adjusted properly also so check that while you have that cover off. Either way it should not cost anything other than time to get it working good.
Also check your tires, make sure they are at the max sidewall pressure. That is usually 44psi but could be 36 or 51 so look on the tires and set them to whatever it says if you haven't already.
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