Another approach, in addition to XYZ's above, that I have seen discussed on this site is partial insulation techniques: seal the hood gaps and insulate just the hood on the inside with non-flammable materials. Make sure that insulation can be removed during warmer months. This is only likely to produce marginal improvements, if any. But like a lot of things we do with these vehicles, piling up lots of small benefits until it makes something significant can be the name of the game.
On my car, I also run with the heat selector set to "cold" because it sequesters a small amount of the coolant from circulating. Shortens warm up slightly.
Belly pan too? With a belly pan you'd have an enclosed engine compartment. If you build it with an easily removed aluminum access panel under all areas where oil and such might drip, you could easily maintain it...
james
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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