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Welcome! I don't think it's due to the balance shaft module or axles.

1/3 decrease in fuel mileage is major. Did you change tires? There's a FAQ article on how to check and adjust camshaft timing (torsion value) but if it's off it won't cause a 1/3 loss in mpg.

When you turn the key on can you hear the fuel pump in tank running?
 
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