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Fastest speed? Mine will drive that needle way down there, way past 85. I feel like I am abusing it any time the needle goes past 75 or so, which is 65ish. It will run over 20 mpg at 60 ground speed, 70 on the speedometer. I like the idea of low cost per mile, a vehicle that is very capable for...

Speed versus RPM calculator I like to use a calculator that uses loaded radius rather than tire diameter. If you figure 15 for the 31 10.50 and 2000 rpm on a 3.08 ratio, 58 mph, 2200 will get close to 65 and 2400 will get you close to 70. I run mine 65 all the time, but it would live a lot...