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If I put it in nuetral and floor it ...it pumps out blue exhaust and runs rough ! but driving it you cant tell anything is wrong ?

well I just bought it and I drive 460 miles per day ...I spend $ 110 a day in fuel at $ 1.65 per gallon ....I have not had valves adjusted and it now sems like it is running to rich ....its only got 175000 miles

I have a 98 FL 70 with a 5.9 cummins and a auto trans ...what should my MPG be ? I am getting 6 mpg now but that seems low ? :-(