No chance that some of it is lost through blow-by, out the main, or other type of seals?Bleyseng wrote: You state that it doesn't leak oil so with that mileage has to be going past the rings and valves into the combustion chamber and burnt. There is no seal to repair to stop this.
Drive it till it dies..
Given the gas mileage, emissions test results, condition of the spark plugs, and utter lack of -any- visible smoke, maybe I should donate the engine to a museum, as an example of its failure to follow the laws of logic and reason?
I still believe its a combination of several things. To be able to cut back on one, would help immensely. That is all I could hope for, lacking the funds to replace it.
Thanks,
John