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      01-18-2020, 09:50 AM   #9
Second Lieutenant
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Drives: '19 Audi RS5 Sportback
Join Date: May 2019
Location: Erie, CO

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Originally Posted by HyeM3 View Post
Actually it's a lot easier than you think. I run the E30 tune and downloaded an app called "E85cal". You put in your target ethanol content and then it has a slider so when you go to fill up you set the slider to about how much is left in your tank and it tells you how much E85 to add to keep that same content. It may not be 100% exact since it's impossible to know exactly how much is left in your tank, but you can get pretty close
That is pretty handy! I like it.

But, as you mentioned, you are running a proper tune for flex fuel, taking advantage of the added E85. In the OP's case, wanting to add this complexity to fill ups on the stock tune isn't really worth the extra effort.
'19 Audi RS5 Sportback

F80 ///M3 | Mineral Gray Metallic | 6MT