CMF Junior Member
Join Date: Aug 2011
Location: Queen Creek Arizona
Re: Bad Gas Mileage!!!
After 12K miles on a new engine, I recently took my 3.6 L 2008 LTZ back to the dealer for a check engine lite, crappy gas mileage and surging under moderate acceleration. Turns out that the CEL was caused by a "stressed" cable going to the purge valve. (Although the dealer wouldn't admit to it, was likely caused by the engine being pulled out twice - once to rebuild it due to high oil usage @ 47k miles - 2nd time to replace it with a new engine as the rebuild spun a rod bearing after 100 miles). They replaced the cable CEL turned off, but still crappy mileage. Over the course of a few thousand miles my mpg went from 24-25 mpg average mixed highway/city to 16-18. Dealer thought the poor mileage was due to the stressed cable and sent me on my way. Mileage was still bad. Not being a big fan of injector cleaning scams, Out of deparation, I reluctantly went to Autozone and bought a bottle of Lucas injector cleaner. I've had good experierence with other Lucas products, so thought I'd give it a try. Added it to a full tank. The surging improved almost immediately and after about half the tank, my gas mileage came back to 25-26 range (30-32 @ 70 MPH highway).
Last edited by 96MN12; 06-01-2012 at 08:04 AM.