Vancouver is a city on the north bank of the Columbia River in the U.S. state of Washington and the county seat of Clark County.
The width of the twin quilt is 66 +12 (for the two extra columns of 9 patches) + 4 (for the two extra strips of sashing) =82, which is a bit wider than your target of 78, but close enough. Plus, it's nice to have it a bit too large than a bit too small.
Bed or Crib: How Long to Make Your Tied-Fleece Blanket. One of the most common questions I am asked about this project is how long to cut the fabric. My recommendation is to go to the fabric store and ask the attendant to cut the fleece to the dimensions you want. A normal twin blanket is 66 x 90 inches. A typical crib blanket is 45 by 60 inches.