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My Father regularly average 23 MPG on his commute to work in his 198x Grand Marquis 5.0, and that was with a loud rear diff assembly. I'm sure if we'd ever have cared enough to fix the noise in the rear end, it would have gotten better by up to 10% or so.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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