[dagrace21]

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

 

[dadunc205x]

dirty MAF? or possibly an inefficient cat? or the dreaded lead foot disease.

 

[taco23]

Yeh, check the MAF and make sure you don't have a clogged cat or clogged/bad exhaust system.

 

[lynchart]

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?