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I just turned 15k last week . I don't drive my truck every day because of poor mileage so i drive my 02 7.3. I drove my 08 last week for the first time in months and i have tried it the past to drive easy for a tank didn't work 360 out of a tank. then i drove a tank like I stole it no difference at all. This last tank i drove it somewhat easy but never went over 70 mph seemed to work got 462 out of the tank. So with that i went down and bought the cetane booster and put it in to see if that helps from reading things off this site and others people say it makes a difference so we will see filled up yesterday and at this point it shows 168 miles and i have 3/4 tank still so I am hoping something works. I get 6 mpg when i pull my 36ft with the race car hand calculated so going on long trips breaks the bank with this truck but i do love everything else about it .
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2008  F350 4x4 6.4 Job 3 spartan
2005 Dodge Viper SRT-10 Mamba Edition 4 sale(sold)
2008 Volvo C30 T5
2008 36f Hallmark
2006 Chrysler 300 SRT-8
2002 F350 7.3
2009 Fastrack Engineering Pro-4 (2010 ASA PRO-4 champion)
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