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slowmover · 01-31-2017, 07:46 PM

10% drop is reason for investigation. This rule was old when I first heard it in 1970s. Fuel and air filters first back then. Next was spark plugs and points. These were after tire related.

01-31-2017, 07:46 PM	#9 (permalink)
slowmover Banned Join Date: Oct 2009 Location: Fort Worth, Texas Posts: 2,442 2004 CTD - '04 DODGE RAM 2500 SLT Team Cummins 90 day: 19.36 mpg (US) Thanks: 1,422 Thanked 737 Times in 557 Posts	10% drop is reason for investigation. This rule was old when I first heard it in 1970s. Fuel and air filters first back then. Next was spark plugs and points. These were after tire related.