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I've got an Edge tuner where it doesn't do anything for mileage. I didn't get it for mileage increases and no it doesn't void the warranty.
The best device (as stated already) is your right foot. I believe one of the best gauges I have is the pyrometer and use it for the hills. The more heat means more fuel consumed, simple as that. Constaintly running the exhaust temps up over 1300 degrees will damage the turbo as well.
When I see the temps climb over the 1000 degree mark I back off usually dropping a gear... I could easily keep the speed up but I have seen a noticeable increase in mileage by keeping the speed down to 100 kms (63 mph) and taking it easy up the hills. 63 in fifth gear is about 2000 rpms in my Chevy... the sweet spot for the Duramax.
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