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Message: [QUOTE="Lassie, post: 522847, member: 8250"] My truck stayed at 16 mpg most of its life only running a performance bully dog tune. My mileage started dropping off fast when front end parts started wearing out. It got to 12.5 mpg before I found problems. The front end unit bearings both were hard to turn with the truck jacked up. My bearings werent even making a lot of noise like you think a wheel bearing would. Give them a check. Another thing to mention....I lost one of the new unit bearings within 15K miles. My knuckle seal was shot on the driver side, which allowed dirt and mud into the spindle bearing inside the unit bearing. If you're already that far into a bearing change, with those miles, might want to change em. [/QUOTE]

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