Question about 1984 Oldsmobile Delta 88

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What is the mpg for 84 olds delta 88 royale brougham

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Hard to say on a older car such as this. If running well and healthly it should receive around 16 to 18 highway miles per gallon

Posted on Jul 16, 2010

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I just got my 84 olds delta 88 a few months ago. I got about 20 mpg for a month or so but it ran weird so i put the fuel treatment in the gas tank. DONT DO THAT!!
I now only get 13-14 mpg and dont know what to do

Posted on Sep 07, 2012

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