After reading the discussion above about e-bikes and single speeds and effort, I feel compelled to include my experience. I have a Dahon Mu Uno single speed and a Bike Friday pakiT 8 speed. I now have a OneMotor electric bike conversion that can go from one bike to the other (in only 10 seconds). I've ridden both bikes with the motor now. On the single speed, I spin out at all but the lowest speeds on PAS. I previously rode my Mu Uno single speed everywhere, including pulling my trailer with groceries, but had to stand out of the saddle on inclines. The gearing is around 60 gear inches. I could push my speed without the motor up to around 15mph if I pushed a cadence of 90 rpm-ish. With the motor PAS set on the lowest of 9 levels, I can much more comfortably hit that same speed, with a cadence of around 78-80 rpm. So, yes, I am working a bit less hard with the motor to achieve the same speed. Now with the geared bike, I am able to increase my effort to gain speed because I don't spin out. I can reach speeds up to 20 mph at my fastest cadence pumping my highest gear. The bike actually will go 28mph with pedaling assist, but I simply won't go that fast, it's too fast for me, lol. I actually work harder on the pakiT with the motor than I do riding the same bike without the motor as I push a harder gear at higher cadence. Without the motor, I never ride in my highest gear, it's just too much mashing for me. Bottom line: the single speed is easier with the motor and less exercise (but better transportation) and the pakiT can be harder and better exercise with the motor. Depends on what I'm after on that ride.