The diesel cost 3 cents per mile to operate and after 167,000 miles you will make up the difference in the $5,000 cost of the diesel engine
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At the rate i drive my tundra (10k per year), that would be in 2024. I don't think i'd keep a truck long enough to see the benefit.
From what i understand, unless more natural gas is forced on those homeowners with oil burning furnaces. Diesel will continue to rise about the same rate as it has, if not faster.
Now if it got high 20's mpg, maybe i'd consider it. But not for 22mpg.