I ride a Juiced Bikes CrossCurrent S. I'm a heavy guy so that has to be factored in.
I'm careful in most situations to accelerate under my own power as much as I can, because acceleration uses a lot of battery, especially with a lot of weight. It takes a little longer to get up to speed but makes a measurable difference in mileage. (How did I measure it? I tried going from 0-15 mph in all five levels of assist. Not surprisingly, it used up more watts at the higher levels.)
Last week I got 50 miles on a charge, using mostly Eco but also 1, 2, cruise control, and Throttle Assist Boost. The latter two aren't dependent on what level of assist you are in. Cruise control uses more current than Eco or 1, but less than 2, 3, and Sport. Throttle Assist Boost uses more than Sport -- it's kind of a rush really. At the end of the ride, the resting voltage read 44.8 V. Since I avoid going below 44 V (roughly 30% of battery), I figure I still had another 5 miles left at the same rate of usage. Probably another 10 miles if I had used only Eco the whole time; it really makes a difference. More, if I went down to 42 V, which is 20% of the battery.
I've also experimented with turning off the torque sensor and relying on cadence sensing alone. Wow, that really boosts the mileage. On a recent ride, when I had forgotten to charge the battery, I started at 44.6 V and ended at 42.6 V after a 20 mile ride on Eco alone. That's just amazing mileage, especially considering that the lower the voltage, the faster the drop.
I charge my battery to 95%, BTW.
So I'm confident that I could get 60 miles with my usual riding style, making use of various levels of assist, cruise control etc., and even more if I started with 95%, used cadence sensor, and kept it in Eco the whole time. I guess sometime I'll have to try starting at 95% and do the Eco-only, cadence sensor mode, take it down to 42%, and see how many miles that is. Problem is, torque sensing is so much more natural and fun, there's not a lot of motivation to try this.