# e10 vs 100% gasoline

**URL:** https://forums.speedlife.net/t/e10-vs-100-gasoline/265436
**Category:** Shift518 Automotive
**Created:** [November 8, 2012, 9:57am UTC](https://forums.speedlife.net/t/e10-vs-100-gasoline/265436 "2012-11-08T09:57:29Z")
**Posts on this page:** 1
**Showing post:** 6

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### Author: ![jdaniels](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/jdaniels/32/6399_2.png) [@jdaniels](https://forums.speedlife.net/u/jdaniels)
#### Post date: [December 6, 2012, 8:52am UTC](https://forums.speedlife.net/t/e10-vs-100-gasoline/265436/6 "2012-12-06T08:52:38Z")

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> [@FS:94 boosted inetgra (new price+pictures)](https://forums.speedlife.net/t/fs-94-boosted-inetgra-new-price-pictures/51088/16):
>
> thanks for posting. i forgot i posted this topic on here so it took me awhile to respond.
> 
> i would like to know what the best air to fuel ratio is for e10. i hear its something like 13.8 to 1 or 14to1 for stoich. but i am unsure maybe one of you guys with more knowledge on the fuel could let me know
> 
> regular gasoline is 14.7to1 without e added. but doesn it change enough to effect the tune with e10?
> 
> also has anyone made a flex fuel map for a honda? or any car that never had one? i know with the saabs if you have a t7 and up you can get a flex fuel tune but if you have a t5 you cant. whats the differences between a car that can run flex fuel and one that cannot?
> 
> i would love to be able to mix e85 with regular gas or run just one or the other with the same map. if this is possibile show me some info or links please
> 
> thanks

O2 sensors are lambda sensors and that’s what they report. They don’t give a shit if you are burning piss or whale jizz as fuel. Stoich is always going to be 14.7 if your wideband controller isn’t adjusted to report the actual mixture for X fuel @ X lambda value. Typically, unless I’ve scaled the stoich value in the tune for the new fuel – I just leave the good old gasoline scaling on my wideband and run it.

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