So, I filled up my 2.2 SOHC VTEC with 93 octane to see if the MPG would increase.

Nope. Granted, the motor hasn't run or sounded that good in a few years, but I found no significant difference in gas mileage after 340 miles. I will, however, try to see if it runs as well with mid-grade. I can here valve tapping on hills in 3rd gear, 3k RPM with 87. That went away with the high grade. Anything to make her go zoom-zoom!

Any suggestions for better performance and ways to help keep her in top shape? Gold plugs? Conical air filter?