I looked at those bikes before buying my bike which is pretty similar. Need a little info before anyone can begin to answer your questions. Mainly which battery do you have? How fast do you usually ride? One motor or both? What's the terrain and conditions, hills, winds etc.? How large, tall & heavy are you? 25 miles at near max throttle is pretty good. On the other hand on PAS 1 and pedaling you should be able to get a minimum of 40 miles on a 23AH 48 volt battery running one motor, using the front motor only as needed not to go faster. As I said I have a similar bike and I am just over 6 foot, wide shoulders and near 200lbs and I can go about 50 on a full to empty battery. I haven't because I don't like running any battery flat! I have been 46 miles and still had a little juice left , maybe 10-15 miles.
Make SURE your tires are aired up properly. If they are low it will really cut your mileage! Low pressure rides good but eats power high pressure rolls easy but rides a little rougher. Most of these tires can run as low as about 5psi and most max out at 20 or 30 psi, try running them right at the max pressure, esp. the rear tire where 90+% of the weight rides.
