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here's what I do.. Fill it all the way, reset trip od... next time I fill it all the way, I divide total miles driven by gallons I just put in.. average this over a couple of tanks you and you should get a pretty accurate read. My tank holds 21 gallons, but I've NEVER been able to put that much in no matter how empty my gauge says I am. Not sure if the sedans had the same size tank as the coupe though...
 

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here's what I do.. Fill it all the way, reset trip od... next time I fill it all the way, I divide total miles driven by gallons I just put in.. average this over a couple of tanks you and you should get a pretty accurate read. My tank holds 21 gallons, but I've NEVER been able to put that much in no matter how empty my gauge says I am. Not sure if the sedans had the same size tank as the coupe though...
that's a good idea, i'll give that a try the next few times i fill her up :D

thanks a million!
 
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