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Fueled up my 2009 Civic Si Sedan, new record 37 mpg, EPA rating 24 city/highway. Only mods I've done so far:
pump tires to 42/42
Scanguage II.
Added hitch and Thule T2 bike rack.
changed oil to 0w-30
Kinda afraid to do engine off coasting with my new civic.
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