When weighing driving against public transit, people consider time, the stress of driving, and the possible discomfort of crowded subways or buses. When it comes to cost, though, it’s easy to go astray. Metro’s cost is immediate, while the cost of wear and tear on the car is only paid in repairs and eventual replacement of the car. That leads to faulty thinking like this letter writer, whose economic analysis this letter writer refutes. Driving from Silver Spring to Arlington costs about $10 in car depreciation; if drivers saw that charge each and every time they drove, Metro wouldn’t look so pricey.