What was originally a 6 miler became an 8.3 miler to get through as much of Ready Player 1 as possible.  Nosed in the left wheel another turn & had the headlights on.  The route was flatter than the last 11 miles.  The frigid night warmed up.  Burned 3422mAh or 412mAh/mile, so a slight but definite loss of efficiency.