When that engine wears out, Some Rangers came with a milder version of the 2.3 that has better emissions and 8 spark plugs (4 in the exhaust ports), and a 1.9 will also bolt in place of your existing 2.3, as will a 3.0V6. The added torque of the 3.0 will give you cruising power at much lower RPM, and may or may not give you a chance to get better FE (I'm gonna say no, though.)
My ex's father is getting 22-24 in his Ranger under "normal" driving, that has a 3.0 EFI in it. I'm not sure if there was a carb version of the 3.0, but AFAIK, the 2.8 carb will also bolt up, but I'm not positive on that.
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Last edited by Christ; 04-30-2012 at 10:21 PM..
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