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Just ran comparative mileage test on our 2007 Silverado 2500 Diesel over 150 miles on flat roadway at constant speed, alternating each 10 miles between tow/noe-tow mode. An initial analysis shows a .22% better mileage in tow mode on flat terrian at constant 60mph. This is probably within experimental error so doesn't matter so I will just continue to tow in tow mode.
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