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You are getting pretty good MPG. Just take good care of the engine with an oil that has molybdenum, zinc in it and very little wear should occur as the miles add up. Body or transmission should wear out before engine does. But that is in general. If there is a manufacturing defect then that's different.
I don't think it's worth it to attempt to modify it for lean-burn. You probably couldn't pass emissions and the $$ probably wouldn't ever break even.
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