BlueSky Posted October 10, 2014 #26 Posted October 10, 2014 Gumout for high mileage engines does a great job of cleaning the intake valves and injectors. The latest I've read on whether to lower the tail gate is that it hurts the mileage. It's better leaving it up. A bed cover might help but I checked the mileage before and after adding a camper cover the height of the cab and it didn't help that I could tell.
Sailor Posted October 10, 2014 #27 Posted October 10, 2014 Supposedly a hard bed cover will help mileage by 10-15%. Low rolling resistance on the tires also helps.
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