I just got my black 2014 Turbo S yesterday, but here's what I've seen so far:
I live at the top of a 3-mile, 1,000' hill. Coming up that fairly fast (not too fast, no knee cartilage left, hence the e-bike) in turbo mode takes up just about 25% of the battery.
I just took a 19-mile ride that used 54% of the battery. Subtracting the first 3-miles down that didn't use anything, and the last 3-miles up that used 25%, that means the other 13 miles took 29% of the battery. I'm 155lbs, and had it in Eco40% at 12-24mph other than the one big hill home. Most of the ride was pretty flat, at least for around here (somebody from Florida would no doubt call it hilly). Eco40 was really too fast - I was passing everybody and generally well over the 15mph trail speed limit - so at more reasonable speeds I'm sure I could go farther. I'm going to put Eco mode back to the stock 30%.
But just extrapolating from what I did, I used just over 2% per mile on the flattish bits. That means I could get around 45 miles riding similarly in Eco40. Cool, though of course I have to remember to only go ~30 miles to make sure I have enough to get up the last hill to home!