Why would you put your motor under load in 6th gear?yea it was under load, this was not the first time i had heard the noise, it was prior to tuning as well i would really notice it in 5th or 6th while under load at highway speed i would hear this noise. I was getting non ethanol 91 at 711, now im going back to the non ethanol conoco up the road from the house, thats what i filled up with this last data log.