When I was at 58 ethanol on my FIRST tank of gas from 3/4 of E85 and 1/4 of 93 the down shifts ( when passing cars ) was noticeably more smooth and linear. Again, this appears to happen about 50% of the time when downshifting. And I am now at 68 ethanol on my second tank of gas. Also these jerks are NOT major, but are noticeably moderate. This datalog is 68 Ethanol - Downshifting from 6 to 5 gear between 71 - 73 MPH on HWY.