My 00' gs-r stock (just got it mth ago) get around 215 in city on full tank. Is that the norm 4 a gs-r? Sucks because my 2dr civic with mods would get almost 400 on straight interstate (I think is insane!) dont remember in city but was way better then 215. Oh yeah I use 93 octane 4 gs-r because manual called 4 92. Says engine will make up for less octane but may reduce performane. Should i keep using 93 or is a rip off or bunch of bs 215 is normal driving not getting on it.