The SD now will roll over an easy 500 miles per tank...how lovely is that!

320-350 used to be the cuttoff...

...my secret? The tank was slighly collapsed from a plugged vent line building vac some time ago in the car's past.

My SD never needs italian tune ups...once it warms up it sees excess of 4500K rpm each and every day The occasional 5500RPM for cleaning purposes and passengers who doubt that diesel's can rev high