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Perhaps my question is the subject for new thread but, what are the advantages of an e85 vs. 93 vs flex tune on a street car?
A flex tune is reading various sensors, injector pulse width, and even the fuel tank level at times to determine when to calculate and how the fuel in
the tank is determined to be what it is.
I've gotten to where I mostly run my straight E85 tune. It works fine for the E85 I get around here which ranges from E70 in the winter to E89 in the summer. I personally like to run a half a tank or so of 93 through the car about once a month just for peace of mind on keeping the fuel system cleaned out. When I wanna do this I run the car down to near empty of E85 and load my flex fuel tune to make the switch to 93 run the 93 out, switch back to E85 and leave the flex tune in until I'm back to around E80. Then I go back to my E85 tune.
My flex fuel tune works just about perfect but I'd never suggest someone race on one etc. I did learn through LOTS of testing that flex fuel tunes are meant for a fuel swap for the most part. Like going from almost empty on 93 to a full tank of E85 or vice versa. Adding a few gallons here or there trying to go back and forth also works, but takes the car longer to figure out. A good compromise might be to get it stabilized around E60 or so to get some fuel mileage if you're gonna drive a lot and still want a decent octane in the tank.
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