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fordman4wheeling
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202 Posts
Discussion Starter #1
hi all i have early 99 dually 4x with swamps injectors 6 position and stacks fuel milage has dropped getting like 10 mpg have never gotten more then 15 even after injectors and chip i thought i would get better.
 

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125 Posts
i have same truck with just a tuner and hollow stock exhaust. i get around 15 too.
 

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Black Stroker
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1,187 Posts
I think a big part is how you drive I know when I didn't care as much I got about 12mpg then I started slowing down not getting on it and just calming down and I get about 17mpg now.
 
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