I did a sort of test today concerning the re-gen set up and have come to the conclusion that it could have been better/applied better... I find that whenever you are going down a steep/long hill and put in re-gen level 4 it doesn't even come close to slowing you down above 20 KMs, yet below 20 KMs you can't even pedal it hard enough to keep rolling? WTF? I think the re-gen levels need to be changed so that when you go down a steep/long hill at 50KMs+ and put it in level 4 it should charge enough so that you should have to pedal a bit to keep the same speed and if you don't want to pedal then you just put it in level 3... The way it is now is that it just doesn't charge enough above 20 KMs to have enough resistance to slow you down and is not charging what it could... JMO as to how it should work...

EDIT; ON my re-gen gauge it shows 75% re-gen happening when I go below 20KMs, and 25% re-gen happening above 30KMs or even 50 KMs both in level 4...?