Quote:
Originally Posted by cycy89
I think it's a very bad idea to run a certain fuel with another fuel's tune, even mixed. Normally they drain the fuel system before they put in a different fuel for a different tune. You don't want your car to "run" dry. I've done that on the track due to the stupid "dots" fuel gauge.
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I agree to an extent.
If you have an A/F gauge, and the car wasnt tuned to the absolute brink of ignition timing... then you have a little margin to work with.
I constantly watch my A/F gauge so I will immediately notice if something goes wrong. I also dont have my ignition timing bumped to the very last degree of making power, so I know it has a couple degrees of wiggle room for less stable fuel.
So I suppose I would say that it depends on how "in-touch" you are with your tuning and monitoring it. If you are a set-it and forget-it guy and dont want to even think about it... than I agree just drain that tank and do a clean swap.