Lots of good advice. I'll second the basics: air up your tires, keep your speed down on the highway, consider a partial grille block when the weather is cold, and practice driving techniques. Most other mods will either have much smaller returns, or will severely impact usability or aesthetics of the car.
I'd like to caution you, the 2nd gen Civic hybrids were notorious for very early battery failure, moreso than any other hybrid I've heard of. I want to say I read somewhere that Honda was seeing rates as high as 30% by just 4 years old.
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