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Colder air means more dense. More dense Less vacuum . Less vacuum less air in cylinder. albeit larger volume when heated.
Unless you wiling to Charge the engine to make some better power< It has all been done before. every second guy has a hot rod. Go the other way. Reduce you power. Increase efficiency less fuel. higher compression less wasted heat. get a better battery. electric water pump, fan and disconnect the alternator. switch to coil over plugs. run hotter plugs and adjust timing for consistent driving on a single fuel supplier.
Colder air means more dense. More dense Less vacuum . Less vacuum less air in cylinder. albeit larger volume when heated.
Unless you wiling to Charge the engine to make some better power< It has all been done before. every second guy has a hot rod. Go the other way. Reduce you power. Increase efficiency less fuel. higher compression less wasted heat. get a better battery. electric water pump, fan and disconnect the alternator. switch to coil over plugs. run hotter plugs and adjust timing for consistent driving on a single fuel supplier.