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Doing my first e30 tune and was wondering if I can just run the car to about half a tank add 3.3 gallons of e85 and top off with 91? I see on stratified's site that you have to run the car near empty then do the mixture. Also, do you need to wait to let the 2 fuels blend? I plan on premixing my e30 in a gas container for future fill ups.
 

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I have done this many times, you absolutely need to drive gingerly for a few miles for everything to mix properly and get into the fuel lines etc..

Keep an eye on ignition corrections and after 5 or so miles get into boost a bit and if there are no bad corrections then get into boost even more until you've gone full throttle.
 
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