Most of your gains will probably be seen from practicing better driving techniques which can be employed free of charge, put to use or taken out of service on a moment's notice, without work or employ, and for absolutely no reason at all.
It's less work to just learn how to make your car do less work.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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