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Bill, the cruise control in my 2012 tundra does the same thing on even slightly hilly terrain so I don't use it. But I do notice 1-2mpg increase when I use it on level drives and freeway stretches. It's not a huge increase, so I don't try to use it religiously.

I just completed a 2700 mile road trip and averaged 12.5 mpg. Most of the miles were highway 50-65mph, with a chunk of freeway 60-75mph and a bit of 4wd. 2012 Tundra 5.7 DC w/ Sun Valley Apache 6.5. I notice much more appetizing instant mpg readings if I stay under 60mph and under 2k rpms (as...