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any other sweet spots? I just got the car and am going to try it at 50 mph and see how it goes. I have read that over 60MPH you dont get much V4 action.

I just got my Tahoe and during a 5 mile stretch of road going 40 mph my car remained in V4 mode for 80% of the trip and I averaged 34 mpg! Any body have any other numbers? My 04 navigator got 19 doing that same drive.