OP's car is heavier and 10x more expensive than yours. Don't read too much into their figure. The King County RTA fee floors at $40, I think, which is what you would pay with a 2006 era vehicle. There's also a $40 Transportation Benefit District fee in the city. I suspect you would pay approximately what I do ($160/year) in the city, or less ($120/year) outside of city limits.