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Mercury Forum - Mercury Enthusiasts Forums (https://www.mercuryforum.com/forum/)
-   Grand Marquis (https://www.mercuryforum.com/forum/grand-marquis-14/)
-   -   TERRIBLE fuel economy (https://www.mercuryforum.com/forum/grand-marquis-14/terrible-fuel-economy-3427/)

MJB DIGITAL Oct 11, 2009 09:29 PM

already checked my tires....inflated em more

i started using only bp gas...WOW

project is planned for the tune up stuff, too

so, after what has been done, i went from 212 per tank to 269.

sweet. that means i save almost $40 a month

conan312 Oct 12, 2009 07:25 AM

O2 sensor(s) surely will help, too.

slymer Oct 12, 2009 11:55 AM

replaced the sensors on mine... helped a little... but on the order of like 5% (less than one mile per gallon). Of course my sensors weren't bad, just half clogged. These older cars do like to carbon coat the oxygen sensors though.


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