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#1 is fuel saver mode
#2 is Towing
#3 is preformance mode is requires 93 oct. or better
hope this info helps.
I thought that #1 was "trans only" which does nothing to the engine settings, it just firms up the shifts.
I've had mine on 2 since I got it. The only tweak I made was to bump up the shift firmness a few points.
Question for you I leave mine on setting 2. How did you adjust your shift firmness? I read the owners book but My edge dont give me the option to customized things.
level 2 works well for me most likly because i can't keep my foot out of it when im on level 3 and the cost of premium gas don't help