Well, I'm back to using 87 regularly again. It seems to ping a bit more in the mid RPM's, but I get better gas mileage. Don't know why, but upping the octane to 89 lowers my gas mileage, so as per Tone's suggestion, I'm going to try some different brands to find an 87 that plays well with my VX. Does anyone have any brand preferences? (I usually use the cheapest I can find )

BTW, how often do fuel injectors need to be cleaned? Is that something we can do ourselves or does it require special equipment?