I use my cruise control almost all the time. The only time I don't use it while in heavy traffic or going downhill. We've traveled from California to Florida with the cruise on almost all the time. I just set the cruise on 65 and relax. I cant see any way the cruise could hurt your fuel millage. It should help. Just my thoughts.
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2007 TK3 Select Suites
2015 GMC 3500 Denali
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