I filled my car up with 90 octane Husky gas (E10, they don't use lower grade gas for blending so regular is 90, mid is 92 and premium is 94) tonight and noticed that it ran much smoother, pulled much harder and revved quite a bit more easily than it does on 87. Normally it feels quite labored in the 1800-3500 rpm range when under high load either accelerating or climbing hills, but over 3500 rpm the fuel and timing map change so it runs a fair bit richer (almost feels like VTEC kicking in). I was the only car on the road for two miles in any direction, and got on the gas leaving an intersection and rather than being labored it spooled up right away and put the power down. It definitely was not what I was used to from this car. Must be time to run something through the chambers to clean it up.