Quote:
Originally Posted by cnk
So, for example, whereas you have to run the tank almost dry before switching from E85 to 91/93 or vice-versa, with the flex fuel tune and kit, you can just fill up with whatever you want whenever and it will adjust accordingly.
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Also comes in real handy when your station changes the E85 mix down to E70 for winter. No need to retune for lower ethanol content.