Running E85 tune, if available is E98 better or while on E85 tune?

[JCDriller]

I occasionally have access to E98. My car is tuned for E85 by 04sleeper. Does a E98 blend or full tank provide me with any additional safety when combined with my E85 tune or will this just lead to it running a compromised A/F ratio? I'll likely do an E98 tune, but I have to straighten a few other items out first.

Thanks!

 

[q6543]

You'll go lean on E98, if tuned on e85.

You'd be ok and rich if you went with E70

 

[JCDriller]

I was concerned about the quality of the ethanol dropping during the fall. I do have a tester kit on order, I'll mix in E98 as needed to keep it close to E85.

Thanks!

 

[04sleeper]

You are fine. Even on E70 it will be fine. No need to mix anything.