I have found Polly Me-Bike will take me (67kgs) 10.5 stone about 25 miles then start flashing the last green when using medium power(underload). I went down to low power when the light started flashing and got another 6 miles before the green started flashing then just about half a mile. Next time I will switch to now power mode when the last green starts flashing and switch to low power when needed for hills. The last mile after I lost power assist was hilly but I managed in 1st gear. Couldn't have done it last year, just wasn't fit enough before I got back on two wheels. So glad I found out about e-bikes, they are the future of commuting/journeying up to 10 milesI think. Light weight and very efficient. Ordinary bikes are very efficient machines but these e bikes are such a joy and for £400 new off Ebay, well, I have saved that in fuel since I bought her AND am getting fit. How is a gym membership? many dead birds with one stone going on here haha. Poor birds, actual pigeons move out of the way eventually for a bike though, another advantage, some on our estate don't even slow their cars down for pigeons or even cats. Nazis everywhere these days. xx