2-3 gallons on something with 100+ mpg could be a pretty long ride. 100-150 miles would be a more likely distance, especially if I'm staying away from freeway/commute madness.
Over the years I've become less enamored of massive engine modification projects, I'm now looking more for "puts out plenty of power in a pleasant fashion stock" engines (like my CTX) so I can try to avoid getting into needing a lot of expensive components like cams, pistons, Carillo rods etc. I could see picking up a spare engine that could be built with some head mods to see if efficiency could be increased modestly without killing power/driveability, but that would have to be a "swap the engine out today, ride it tomorrow, put the standard engine back in the day after" kind of deal.
I think chassis/aero mods are a lot better fit for an affordable DIY project.
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