How many miles in a Minneapolis city block?

There are about 10-12 city blocks per mile, so there are about .1 miles in a city block.

Source: Hudson's Dictionary of Minneapolis (1906) states:

In downtown, there are 13 ordinary blocks to the mile. South of 24th St the north-south blocks are longer, running 8 to the mile and east-west blocks are half as long, 16 to the mile.

Review of neighborhood maps with a scale of 1.25 inches = 1000 feet confirms this measurement.