Info on truck below in my signature:

I now have approx. 180K miles on it. I have no clue when the or if the injectors were ever replaced. I get a small amount of blue smoke when its cold out and I start it up in the morning, a small amount of black smoke when I start it and the truck is warmed up. I may need to replace a few glow plugs as well. Other than these minor issues, I get about 15 MPG whether driving on the highway at 70 or around town. Ihear about people getting upwards of 17-20 MPG and am wondering if maybe I should embark on replacing the injectors.

Thanks.

I would do it anyway as you are way past their recommended service life.

Any reccs. on what replace them with? I tow and do not need to smoke any tires or other trucks/cars for that matter.

Thanks.

I'm going to do mine soon, I think, and I'm going to go with new Delphis.