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I use a few ounces of Stanadyne Lubricity every fill. Who knows what it really does, but on my last highway trip I managed 20.3mpg @ 65mph.
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2002 F250 7.3 PSD XLT 4x4 EXT Cab Shortbox - EVO2, AIS w/Zoodad, MBRP 4" 409SS, 08 rear diff cover, 6.0 Trans cooler, Heated tow mirrors w/signals
1988 Mustang GT 9.71 @ 143 (1.43 60ft)
2008 H+H 24' CL series V Nose Car Hauler
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