Yeah, it’s probably closer to accurate, but the irs grossly overvalues miles driven in a Prius, and undervalues mileage in an F-350. It’s the best average they can calculate. It also pays the same in a $30k f-150 and a $85k f-150….so I like to roughly calculate my own.

(Truck value - residual value at 150k miles)/150k = depreciation per mile (I don’t keep them past there, and it’s fairly easy to get a residual value using kbb and a few assumptions on time till I get to 150k miles.

That comes out to 30 cents a mile…or $900 for this trip.

Maintenance costs that I calculated were mostly oil changes and tire wear, both of which I have a good understanding of the cost and life expectancy of them. I replace tires roughly every 40k miles at a cost of $1200 or $90 in tire wear for this trip.

Oil change is $100, of which I do every 5000 - 6000 miles….so $50

Lastly, the mileage difference between my vehicle and the Tahoe was 5mpg, over 3000 miles that saved me 36 gallons of gas, at $4.00 a gallon roughly at the time, or $144 in gas savings.

Totaling….just about $1200. Now there are other things that would have cost maintenance….but I’m not about to calculate the cost of every filter and fluid…so I left that all alone.

It’s a math exercise, does the cost of the rental exceed your depreciation + maintenance on your current car, if so, take your current car. If the cost is less, rent one. Recently took 3000 mile trip, would have impacted my vehicle to the tune of 1200 bucks, i instead rented a Tahoe for 800.