As a rule anything that moves the powerband up will hurt FE, this includes but is not limited to headers, cams, intakes.
Any reductions in parasitic loss will help, but keep in mind where they save x hp.
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2016 Tesla Model X
2022 Sprinter
Gone 2012 Tesla Model S P85
Gone 2013 Nissan LEAF SV
2012 Nissan LEAF SV
6 speed ALH TDI Swapped in to a 2003 Jetta Wagon
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