Just a note, this is at best a ballpark in terms of the "actual" cost. Fuel obviously varies (at $3.50/gallon and getting 20 MPG, that's $0.175/mile; at 40 MPG, that's $0.0875/mile; at 10 MPG, that's $0.35/mile). Insurance, depreciation, and so on are a lot more variable (it depends on the cost/quality/age of your car and so on - a 2008 Crown Vic is going to show up as a lot less than a 2022 Mercedes). For an electric car, there's going to be rather less cost on the fuel size but the depreciation/repair accounting is going to be rather higher (Teslas are infamous for expensive repairs, for example). I'd actually argue that the IRS calculation is probably somewhat above average to reduce the number of times that folks are going to have to fight through depreciation tables and so on (not to mention that letting folks pocket the difference provides a mild incentive towards using more efficient cars).At the IRS estimate of operating costs for motor vehicles ($0.625 per mile), you just spent $200 for the 320-mile round trip, plus you had the aggravation of a 6-hour drive along I-95. Maybe you should have just spent the $200 on the train ticket for your daughter. Another possibility might have been to just drive to New London and have her take the Shore Line commuter train to New Haven, and then Metro North to Bridgeport, although I'm not sure if the Shore Line runs of Sundays.