The key is to be consistent. You cannot ride every day an not have positive results. At least that what I tell myself .
Often I ride 27 miles and use 2-3 bars on a Easy Motion. I'm around 175 lbs. I'm not in great shape The typical rie ride has a 800 ft gain, much of it is gradual. What is the difference? Speed and effort. The trail head is 3 miles from my home. When I feel lazy I just crank up the power and let the bike take me there and back full speed. On those rides I end up with less juice, usually a bar or two. Sometimes I set out with the goal of just using two bars. In those cases I keep things in eco, turn off the motor as much as possible, and only use assist on uphill or high traffic areas. The last few miles are the toughest. BH bikes want to go, will got over 20 mph, and are pretty efficient in eco and sport. They also don't show you the amount of effort the motor is contributing like other brands so its harder to tell. Hills us a lot of power, make sure to feel yourself contributing and getting a bit out of breath going up hills. BH bikes are overly happy to help out, even in eco. The trick to using less juice is to slow down a bit and peddle more. Even turning off the bike on flat. Of course, you don't go as far in a particular set of time, and that is the trade off. I love range, during the summer I hoping to do 70+ mile day trips and I'm working on finding the exact motor and fitness level so support this.