help, im new with my integra

Help please, i just got my '96 integra rs, and i only get about 375-400km for a full tank of gas but my friend used to have an integra and hers went up to 500km for a full tank. What should i do to bring up my gas milage?

lose the lead foot

well i know how to drive i had a '95 civic si before this and that had fine gas milage, im driving this integra pretty much the same as i drove the civic except i shift at lower rpm