Nice story, but it ain't true. I'll quote directly from my surveying textbook.
"The measuring device in popular use during the time of the settlement of North America was the Gunter's chain, which is 66 ft long, subdivided into 100 links. The length of 66 ft was chosen because of its relationship to other units in the foot system of measurements:
80 Chains = 1 mile
10 square chains = 1 acre (10 X 66 squared = 43,560 Ft squared
4 rods = 1 chain
End quote"
That is why most old roads have a 66 ft of right of way (i.e. 1 chain). Most alleys have a 33 ft width (i.e. 1/2 chain).