Sounds simular. I was watching some of my in car videos cruising the back roads and i was shifting at 6000 most of the time on pump gas. Now with a mix of 110/93 sunoco i find im shifting at 6500+ just going by sound and feel. On the street i rarely watch the tach. I have a vid edited that i will try to post. Had too much 110 to 93 and it didnt like it. Real fat but gives an idea .