# E85 content analyzer? **URL:** https://forums.speedlife.net/t/e85-content-analyzer/258358 **Category:** Shift518 Automotive **Created:** [May 11, 2011, 6:18pm UTC](https://forums.speedlife.net/t/e85-content-analyzer/258358 "2011-05-11T18:18:49Z") **Posts on this page:** 1 **Showing post:** 6
### Author: ![TurboTravis](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/turbotravis/32/6406_2.png) [@TurboTravis](https://forums.speedlife.net/u/TurboTravis) #### Post date: [May 11, 2011, 6:59pm UTC](https://forums.speedlife.net/t/e85-content-analyzer/258358/6 "2011-05-11T18:59:17Z")
> [@Buffing Gel Coat](https://forums.speedlife.net/t/buffing-gel-coat/42109/11): > > What was your target A/F on your current tune? Ethanol has a wide A/F range in which it produces maximum power, the swing from 70ish to 85ish will be less than a point on a wideband. I would say that most tuners (myself included) tune on the side of rich when working with winter blend. Honestly though, your car should still be adaptive for the most part. Your short term and long term fuel trims (if still enabled) will make up for the minor difference. What he said. Also realize that the anti-knock qualities of E70-85 are virtually identical, however ethanol has the tendency to detonate when ran rich, so that is what gives some t00ners the idea that E70 is not has knock resistant as higher blends (car knocks when run on winter blend, when originally tooned on summer blend). --- _[View the full topic](https://forums.speedlife.net/t/e85-content-analyzer/258358)._