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Downsizing your engine is only effective if your current engine is capable of making too much power for the RPM/vehicle speed you need to be at.
The mileage gains aren't all that high, that I can tell, either, because the only thing you're really lessening is the internal resistance of the engine, pumping losses and frictional losses. Sure, that accounts for a large bit of engine power lost, but there is much lower fruit ready to be picked.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
I'd like to think that people might open their eyes at some point... instead, I find it more and more likely that I'll just close mine.
-- Author kept secret.
Je ne veux pas d'une meilleure vie. Je veux être heureux avec celle que j'ai maintenant.
(I do not want a better life. I want to be happy with the one I have now.)
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