I had a 2002 Camaro Z28; talk about a redneck rocket. Never got above 105 though. Undulating roads and deer can be deadly at 55, so I backed off quick. I got my 11 Hemi Outdoorsman bouncing off the governor at 106ish when I had that, but the new truck hasn't seen above 90. Haven't had the desire or roads comfortable/cop free enough to do that. These trucks are really stable at speed though.
*I was in Mexico a few times...
I can say in the 75mph speed limit areas, I set the cruise control at 80mph and it just cruises at like 1,700 rpm like nothing with the ECO light on.
FWIW, the eco light is based throttle and RPMs. I think of it as every square is a rectangle but not every rectangle is a square; any time MDS kicks in the eco light will be on but the eco light doesn't guarantee MDS is running. I'm not saying yours won't be either, but unless I'm going downhill or have a serious tailwind I don't think my MDS will stay on at even 75. Gearing (3.92) or still breaking in (I'm under 5k miles, but it does seem to be loosening up), or maybe I'm always hitting a headwind...
