# E85 content analyzer? **URL:** \ **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:** 34
**Author:** ![HKSPOWEREDGTR](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/hkspoweredgtr/32/6704_2.png) [@HKSPOWEREDGTR](https://forums.speedlife.net/u/HKSPOWEREDGTR)\ **Post date:** [May 15, 2011, 1:12pm UTC](https://forums.speedlife.net/t/e85-content-analyzer/258358/34 "2011-05-15T13:12:41Z")
> [@Talk about picking the wrong place to break into](https://forums.speedlife.net/t/talk-about-picking-the-wrong-place-to-break-into/42210/4): > > A few times now. In mid April it was about 68 percent, and as of a couple weeks ago it was sitting at 74 percent. Keep in mind that what’s important is keeping your content consistent while tuning, and not the overall content. From what I’ve seen so far, a good tune on E77 will run anything from 70-85 fine. I’ve personally witnessed NO change in AFR when going from E81 to E76 (logged multiple pulls, not just glancing at the wideband). Eventually I’ll test from 70 to 85, etc, and record any changes. TurboTravis, I didn’t measure my ethanol content % before getting my tune in March, but now after reading some of your measurements, I’m thinking I am wrong to assume it was E70 in March. I was under the impression that this region dispensed E70 in the winter, E85 in the summer…and the times in between were somewhere between the two (in other words, there was only a 15% range). From what you’ve analyzed, it sounds like you’ve seen a seasonal range of more like 30%…which makes me wonder if I was pumping ethanol in the 60’s. I did a few datalogs now and see that my fuel trims are adding some fuel to avoid going lean, so I’m working with my tuner to get things back in line. Make sense I might be seeing the trim situation I have if my original tune was on E65 and I’m pumping E80 now @ RT 7 Mobil? --- _[View the full topic](https://forums.speedlife.net/t/e85-content-analyzer/258358)._