Just wanted to move some Efficiency info from my earlier build thread here:http://www.endless-sphere.com/forums/viewtopic.php?f=3&t=25082&hilit=mid+drive&start=45
And here is a basic thumbnail of the info:
Distance: 8 miles
Average slope: 3 - 12%
Watt Hours Per Mile: 10.75 (86 WH's for 8 Mi. )
Amped Bikes 9 x 7 DD rear hub motor used as mid-drive, using 1/8th bicycle chain from motor to NuVinci rear hub with a 3 to 1 single stage reduction (13T to 27T, using track a cog on hub motor and sprocket from Staton Inc.) with an effective gearing range for 7 to 30 MPH.
And now my latest build, I have done a longer trip to include the same hill with the exception of the few blocks of 10+ % grade hill (my gearing is too tall, have to wait to get proper gearing to get the full potential of this new motor) and using even less Wh/Mi.
Here are the stats:
Distance: 42 miles
Average slope 3 - 10%
Watt Hours Per Mile: 8.7
(This second test was on a day with virtually no wind, at at about 56F temperature)