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Careful which hot rod tricks you choose.
Many hot rod mods are oriented towards maximum horsepower production. This means many mods are for the sole purpose of running higher than stock rpms. If you are wanting to save fuel, you won't go there. At all. That includes flow mods like "ditching the cat" which really doesn't help anyway.
Now, the mods that will help will be the ones that reduce parasitic losses and improve torque. Underdrive and/or eliminate power driven accessories, bump compression, and the like. Match the engine mods to the gearing and yes you won't be running a hot rod high final drive ratio either.
Build for the fuel you want to use. Here in the Midwest I could build a radically high compression engine and run it on E85 which is both high octane AND cheaper than regular. None of that premium fuel nonsense.
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