[steve99]

Originally Posted by DrButtDrugs

How long is it safe to ride around on the incorrect tune when switching fuels?

This question popped into my head when I took a wrong turn out of the only e85 gas station near me and ended up in a mile long tunnel before a shoulder was available. Right after entering the tunnel, of course, my fuel trims starting shooting up. I kept it around 45 mph (in a 55 zone) and didn't break 3k rpm. As soon as I got out of the tunnel I pulled to the shoulder and reflashed the car.

This was a week ago and I know there aren't any problems at this point, but what are the limits of this kind of thing? Is it safer to drive on the e85 tune with 93 in the lines, or 93 tune with e85 in the lines? Any difference? How far is too far?

if you stay below 3500 rpm light throttle you could run a whole tank through car on incorrect fuel.