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I normaly get between 17-19 miles per gallon (99 3.4L Prerunner) durring day to day driving. suddenly my milage has droped down to between 11-14 miles per gallon. everything is well maintained and air filter is cleaned and proper.... anyone have any thoughts? thanks very much
DAN
 

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I have the same problem, I get around 11 mpg with deck mod and everything amsoil. How do you check to see if the cat is clogged? or bad exhaust?
 
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