Originally Posted by
rdlangston13
I did a little experiment tonight to see the relationship between speed and fuel mileage on my way to work. During my drive I encounter speed limits ranging from 55-75 mph so I would reset the fuel mileage calculator on my truck each change to get an average economy for each speed. Truck is a 2006 Dodge Ram 1500 Quad Cab 2WD Hemi
55 mph - 22.8 mpg
60 mph - 21.7 mpg
65 mph - 20.3 mpg
70 mph - 19.6 mpg
75 mph - 17.3 mpg
Clear drop off as speed increases, especially from 70 to 75
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