The other day I am on a major four lane highway, level grade, and I am cruising at 65 MPH. I am in ECO Mode and I put the trans lever into Manual to check what gear I am in. Now I am not accelerating, just feathering, no uphill grade. The indicator in the Speedo Housing reads, M-4. I thought it would be M-6?? No load, no grade, no acceleration to speak of. I checked a couple of times and it never read M-6. I did find it in 6 one time, put it into manual and drove for a while in 6, even doing a little accelerating. What say you?