six6six Posted March 16, 2008 Report Share Posted March 16, 2008 I was wondering if any of you had any tips on mpg? I just got my car I test drove one other deville same year it had 77k on it and got 18 mpg. When I got mines it had 44k and got 14.2 now its at 13.6. I run 91 octane and im not heavy on the gas any tips or ideas would be great. thanks Link to comment Share on other sites More sharing options...
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