I have 10k miles on the Honda. Car can run on 86 octane if it were available, otherwise it calls for 87, which is what I run. Would you guy's suggest that I run 89 or higher to keep it cleaner? Also, is it time to give it a shot of Redline Fuel System cleaner? I'm thinking 1/3 of a bottle. I believe 1 bottle treats up to 100 gallons. My car only takes about 12 so 1/3 shoud be plenty strong. Last question, are their any negatives of using Shell V-Power (93 Otctane) when my car calls for 87 other then $$?