I guess I need to buy some lighter shoes or I'm destined for sub 30mpg.
Jesse, those 300d's were the Timex of cars, "Took a licking and kept on ticking". They were just about impossible to kill unless you hit them with a semi. And even then they would probably drive off anyway.
If you remembered to change the oil regularly, changed the fuel and air filters every so often and threw a can of Lubri-Moly in the tank occasionally they would easily hit 500k.