Join Date: Dec 2005
Feedback Score: 0 reviews
My just bought -89 is getting 19.5 with 600 lbs of sand in the box for traction in 1/4 town, 3/4 highway driving. I expect to get well over 20 once the sand is gone, and with some trying. I'm considering increasing tire size a bit in the rear to lower the overall ratio. Diff is 3.55, trans ZF-5. I use ashless 2 stroke oil at 1:100 and some Power Service additive. Oh, and gate up, always. I think Hot Rod magazine did test runs years ago both ways and they got better results gate up.
1989 F250 7.3IDI, 2x4, SC, LB, ZF-5, 110K, bone stock, no bells, no whistles, no frills, no nonsense.
1997 F250 7.3DIT, 4x4, SC, LB, E4OD, 120K, 203F stat & coolant filter, otherwise stock,
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Last edited by jyrks; 01-20-2010 at 10:44 PM.