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  1. S

    2018 Yukon Denali Flex Fuel?

    Well I went through the full tank of fuel that was 50% E10 93 and 50% E0 91 and the ethanol reading never changed from 9%. I’m thinking it doesn’t have a sensor, and that it is tuned to run on E9 all the time, and the AutoSync just happens to display it. Once I install the sensor and activate...
  2. S

    2018 Yukon Denali Flex Fuel?

    At least around the mid west, all gasoline has up to 10% ethanol in it. You can find pure gas (non oxy) 91 at certain stations, they'll have a separate nozzle/pump for it, but it legally is only allowed in small engines, and vehicles eligible to be registered as a collector, which in Minnesota...
  3. S

    2018 Yukon Denali Flex Fuel?

    To turn off AFM and to be able to tune my BCM. Now just going through and playing with the various features too. I put in 13 gallons of 91 non oxy and so far have used 3/8 of a tank. The AutoSync is still reading ethanol 9%. I'm thinking at this point it's not a real measurement being...
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    2018 Yukon Denali Flex Fuel?

    I’d feel more comfortable going lower on the ethanol than higher until we know if it’s reading correctly. I don’t want to run more ethanol than 10% until it’s tuned for it.
  5. S

    2018 Yukon Denali Flex Fuel?

    Well that's interesting. That doesn't seem like a very reliable way to measure it. So if I fill with non oxy and it reads as 0, I still may not have a sensor, but it can sense the alcohol? Not sure I'd want to run full e85 that way.
  6. S

    2018 Yukon Denali Flex Fuel?

    Not strictly e85, but want to run any combo of e85 and 93 depending on what is available. Correct, but my truck shouldn’t be able to sense the alcohol content without a sensor.
  7. S

    2018 Yukon Denali Flex Fuel?

    That's what I believed to be true as well, which is why I was confused when the AutoSync was showing me ethanol content. I've found a kit that I'll use if I need to, but would be cool not to spend the extra money if I don't have to. We'll see what happens when I put the non oxy in and if the...
  8. S

    2018 Yukon Denali Flex Fuel?

    I saw the wiring going to the sensor, but I expected the sensor to be more like a T fitting, not just a bung. I guess we’ll see when I put the non oxy in if my reading changes. Would be nice to only need a tune and not buy the flex sensor stuff.
  9. S

    2018 Yukon Denali Flex Fuel?

    Hmm, ok. Thanks. I think my next move will be to fill up with non oxy gas and see if the reading changes. Maybe 9% is just a default value and it’s not actually reading? I still have 3/4 of a tank, so it’ll be a few days, but I‘ll report back.
  10. S

    2018 Yukon Denali Flex Fuel?

    Well I found a sensor, but it’s not what I expected. Does anyone know what this sensor is? I didn’t see anything else in-line under the truck, though the lines go above the fuel tank. But I wouldn’t think they’d put the sensor there.
  11. S

    2018 Yukon Denali Flex Fuel?

    Ok, thanks. I’ll stick my head under there tonight after work and see if I can find anything. No, this device is only monitoring and displaying engine data, you can’t tune with it. You can tune the body control module, radio and hvac, and instrument cluster with it though. AutoSync
  12. S

    2018 Yukon Denali Flex Fuel?

    Hi, been lurking for awhile but first time posting. I have a 2018 GMC Yukon Denali with 92,000 miles. I just installed the AutoSync device from BTDieselWorks and going through the various pages. Under the powertrain data page, where it lists things like MAP vacuum, engine load, ECT, and the...

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