Earlier quoted context omitted.
Outside of very large cities where filtering is legal, the maintenance costs eat up any money you save over an economy car. Tires are especially brutal- my commute makes me have to replace both tires every winter.
My tires will have to be replaced in the spring but maintenance costs other than that are about $120 for oil change and filter once per season. What other costs are you getting?
Oil filter for my car: $8, lasts 15000 miles
Oil and filter change for my least expensive bike: $22, lasts 1500 miles
Oil and filter change for my lowest maintenance bike: $67, lasts 6000 miles
Valve adjustment: $200-300 for a professional to remove the head and cams and adjust the valve shims. Interval varies, usually every 10000-15000 miles on a bike. Not required at all on a car due to hydraulic lifters that are fine for a car engine but can't move fast enough for a high-revving bike engine.
Final drive: Chain and sprocket need replacement every 12000-15000 miles, costs about $150 or so. Shafts need shaft oil every 10000 miles, dunno what the price is since I've never had anything other than a chain. Most cars last 100000+ miles without any transmission service.
Spark plugs last 100000+ miles on a car but usually are changed every 10000-20000 miles on a bike. Modern bikes often use multiple plugs per cylinder. $5 per plug.
The tires are the main killer for me. A set of tires on my car lasts about 6 years, while I have to replace tires every year on my main bike. That adds up very quickly.
Other costs:
Coolant every 4 years, brake fluid every 2 years, but that is similar on the car.
I have to admit that good coverage bike insurance is cheaper than good coverage car insurance as long as you stay away from sportbikes and hoon machines.