195whp 1.8L all motor

first time i did a long distance driving, and i was SHOCKED with my cars performance

i filled up the tank with 93 octane shell gas

traveled 174.xx miles

went back home and refilled back to full tank

only filled in with 4.06x gallons!!!

that equates to about 43mpg!!!

ill upload pictures when i get back home


my question now is... how lean can a b series be tuned on with 93 octane and not damage the motor???