Should I need an alignment after...
Gas going down faster, can be due to heavier wheels and or tires, thus more rotational mass for the engine to move.
The wheel wobbling when applying brakes is the rotors are warped. You might have over tightened the lugs.
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Too much "toe-out, and you'll wear the inside edge faster.

The camber might be a factor , but most likely it's too much "toe-in".



