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TGresham makes excellent points supporting LOP operation. My own analysis came up with similar results (I think I figures 7.50 per gallon). However, at my rate of usage, it would take 10 to 15 years to reach TBO, and my payback period would have been well over 5 years. This is a longer payback period than I was comfortable with. But, that is a personal choice.
On the other hand, if I can reach a comfort level that the purchase of an expensive engine analyzer is going to pay for itself within that time frame due to extended engine life or maintenance savings, the purchase decision becomes easier.
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