Quote:
Originally Posted by Old Tele man
...here's an equation for vehicles in the 3,000-lb. range, attributed to Detroit, that's used to estimate weight changes upon fuel economy:
(MPG2 / MPG1) = (WT1 / WT2)^(0.72)
...where: suffix-"1" is old and suffix-"2" is new.
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MPG2 = MPG1*(WT1/WT2)^(0.72)
MPG2 = 26*(3000/4000)^(0.72) = 21
Not even close to what I observed. If I had dropped below 24mpg I would have to get gas at both ends of the trip. Only once did I have to get gas midway in the trip, and that was when I had beds hanging out the sides and over the top.