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Originally Posted by BabyDiesel
I would look into custom engine tuning.
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So would I. Apart from the EFI tuning, there are other pathways that can do little miracles to fuel-efficiency, such as valve timing, intake and exhaust flows, and even forced induction can help in certain situations.
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How do you feel about emissions? Running lean will increase your NOX output, and idk how you feel about making emissions worse.
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That's a good excuse for experiences with gaseous fuels such as propane and CNG, as they tend to decrease the intake temperature, thus NOx levels are also likely to go down.