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Old 10-24-2012, 06:57 AM
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Default Switching from 87 octane to 91

(Sorry if this isn't the best sub-forum, please move if necessary)

So I bought the superchips tuner recently and have been running the mileage tune, which is great for highway driving. Still sucks city driving on MPG. Anyways, I want to try the 91 octane tune.

Do I need to get every last drop of 87 out before I fill up with 91? or just run it till the light comes on? Because there is still what...~5 gallons left once the light comes on?

I guess I could siphon it into a gas can (hate to waste it) then put the 91 in? SUGGESTIONS PLEASE!
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