The bike is a cheap, generic bike I've had for years, so my base cost wasn't too high (nothing). Since converting it and putting my car into storage six months ago, as of this post I have traveled 1,061 miles on it. I've only had to replace one tube (rear) once, and both tires easily have another 1,000 miles left in them. The bike has performed really well, and with the combined savings on gas, maintenance (hooray for no oil changes!), and insurance, I save about $200.00 per month. Since 6 x $200 = $1,200, this means that the bike paid for itself in six months, and that every day from here on out is pure gain. Direct drive motors like this one are projected to last about 5-8 years with regular usage, and at the rate I've been going it'll be about 8 years before the battery dims to only 75% of its charge capacity. In other words, this should carry me well beyond medical school, saving me about $2,400 per year of consistent use.
Lithium batteries, however, just can't help being lightweight and awesome (and expensive). With this battery on dry, flat road I get about 20 miles to a charge (about 17 in winter, more due to added clothing (think drag - the air resistance type, not the big-city-Saturday-night-type), weight (stationary inertia!), and lower tire pressure (coefficients of friction - hooray physics!) than to the temperature, which has almost no impact on lithium battery performance), with recharge times taking about 4-5 hours from a bone-dry battery. At my local electricity rates, it only costs about $0.04 for a full recharge using the included charger, which means that I've only paid about $2.35 in electricity for all 1,061 miles so far.
Most interestingly, $2.35 is actually WAY cheaper than it would cost to purchase the food to account for the extra calories that my body would require to power the bike 1,061 miles by pedaling. I would also be willing to bet that the power plant released less pollution in generating the electricity to charge my battery than my body would have with the equivalent end-product waste after eating those required extra calories... I'll be honest - environmental friendliness was more of an added bonus to this plan rather than a driving motivation, but it definitely came out in a way that would please the most avid of tree-huggers. Anyway, back to the breakdown:
Note: the Thudbuster above is covered by a protective black sheath, the "Crudbuster," and can be removed and washed if it gets nasty from road salt or mud.