$940 and 1800 miles? Isn't that $1.91 a mile for maintenance alone? What about the cost of the bike itself being factored in? Everybody can spend any kind of cash on any thing at all (and do) but this seems a little overboard to me.
My first real bike cost $90 at a police auction and took me 53,000 kms before it rusted out and fell apart. My second bike I put together myself and cost me $400 in parts from a consignment store and only took me about 14,000 kms before it was crushed by a car but it was replaced by the cars insurance payout so my replacement bike (1500 - sort of free - dollars) didn't cost anything and it's taken me 25,000 kms. My fourth bike I bought for $180 and it's taken me 16,000 kms. Throw in 3 cheapo bikes that I payed less than $100 for and rode for about 3,000 kms each before they fell apart, and I have had 7 bikes that I paid $770 for with 117,000 kms use plus my yearly average of $110 maintenance (20 years- $2200) and I end up with .39 a km total cost (and I'm still riding 2 of the bikes that have been accounted for here so my costs are lowering with each km).