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Thanks for the input. I'll try that out. I asked the tech why would there be a wrong mixture, since the yukon is a flex fuel it should be able to take both no matter what. He told me that they don't mix well. If you are running regular, you should stick to it until it's time to refill and...

Anyone with a flex fuel yukon having problem with check engine light. After filling up my tank with E85, my check engine light came on as well as error codes for the traction control and the stabilatrack. Now the car keeps jerking when going into 2nd gear. I took the yukon back to the dealer...