I did not really consider that my crank drive mountain bike would save me money by replacing car journey's on my ride to work and back but was more interested in the ability of the bike off road, the exercise I would get and most importantly the fun!
However two return trips saves a gallon of fuel and wear and tear on the car so that is a real saving.
Though as I have found out they do chomp through chains, cassettes, chainrings , brake pads, tyres and other bits and bobs and are not as cheap to run as I had thought when I got it. Fun fun fun and great exercise though. I have also destroyed two rear mech's and a rear wheel, fun though!
I am up to 10.166 miles now, all be it not without solving the odd issue along the way but the ability to ride a proper in places demanding off road route to work makes it worth it and fantastic fun.
£1750 for basic bike back in 2015. Original battery still working well although I had to replace the connectors on my charger and battery myself ( less than £10 for new connectors of ebay) to avoid having to buy replacements. I also had a new motor fitted by my bike shop after 6000 miles free of charge under warranty when the bearings on the first motor developed play.