I average about 28mpg with 50/50 highway/city driving. I would get better if i didn't feel the need to vtec so often
All highway using cruise control at about 55mph, I got 34.9mpg
I even took a picture of my tripometer cuz it was over 350miles lol I'll have to post that up later... I was just impressed my Si broke 350mi on one tank and only needed like 10 gallons to fill it up
I have recorded every tank of gas since i got the car over a year ago... I keep it all in an excel spreadsheet so i can track my milage and stuff.
dont ask, i'm wierd :P