Join Date: Aug 2012
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With mine, I was getting 13.2 mpg (mostly city/rural driving. Lots of stop & go, nothing mroe than 60 mpg).
I changed ALL fluids, aired up tires, went through my fuel system (forward of firewall), rebuild my fuel bowl, FPR Shim, and cleaned out that tiny screen (which was clogged almost solid-not sure how it ran).
Another trick (or so I've read in here) is to change out your fan blades with a 6.0 fan.
Checked my mileage yesterday. I'm getting 16.26 mpg. And still fighting a mysterious fuel leak.
Best part aboutdoing all this: you will KNOW the overall condition of your truck. Amazing the little things you find when youre slumped over your radiator for 6 hours!
Good luck. Let us know what you find.