Re: 6.0 best fuel mileage
2005 Lariat Crew short bed, stock with STC canned tune, blue spring, 305/65R18 BFG Discovery, made 4 trips from Southern Michigan (Jackson) to the Upper Peninsula (Marquette), about 450 miles each way. Each trip on a single tank of fuel most of the way at 78mph using cruise, with real world calculations averaged 16.5.
First time driving up I took my time, drove manually(no cruise) just at or below speed limits, no stops at all, between 70 and 75mph, averaged 17.5mpg real world calculation.
I did use the dash calculator as well, and over all for the whole trip it averaged out the same or pretty close. But with that I could see what speeds really negatively affected the averages. The truck really seems to like 65 to 70 mph better than 75 to 80... From about mid Michigan to the south the speed limit is 65 and 70mph. You get above St. John's, and it's pretty much 75mph all the way past the bridge then 65 and 70 again on the smaller highways past St Ignace. I could get a good idea of what speeds boost the over all average and what killed it this way.
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