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Chevy/GMC Trucks \  how do i improve gas milage???

how do i improve gas milage???

Chevy/GMC Trucks Make Specific
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xLaYiNFrAmEx   +1y
my 4.3 in my sdime gets real shitty gas milage.....what are sum things 2 do, or parts 2 buy that will imporve it??? and why is my fuel pump buzzin so damn loud??? i kno its supposed 2 buzz a lil but its startin 2 get real loud
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