Well, around town driving and an automatic transmission both contribute to lower gas mileage, but 12 mpg is pretty low. Do you have a trunk full of things? What's been done to the engine? Any mods? What's your fuel pressure? How do your spark plugs look? How has it been running? Are there any trouble codes? What was your mileage before the rebuild?
Help us help you.
Take care,
-Chris
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