The IRS allows business travelers 58.5 cents a mile.
That is closer to your total cost of use of your automobile.
IRS 2022 Business milage rates:
https://www.irs.gov/newsroom/irs-issues-standard-mileage-rat...
That is closer to your total cost of use of your automobile.
IRS 2022 Business milage rates:
https://www.irs.gov/newsroom/irs-issues-standard-mileage-rat...
The average vehicle costs $40k, is owned for 11 years, gets driven 13k miles per year, burns 25 mpg, gas costs $3/gal, insurance is $1500 per year, and the vehicle needs $900 per year in maintenance and repairs.
A lot of people spend far less than this (my car cost me $0.384/mile so far), and some spend far more, but it's not a bad approximation.
And built into the IRS rate is probably an expectation of significant repairs.
That changes the capital costs.
Most people are paying 4.00 to 5.00 dollars a gallon these days.
At a generous $4.00 a gallon, and as you indicate, .04 gallons per mile, gas alone is lately above 0.16 cents a mile. At $5, that would be 0.20 cents.
Generously (on the thrifty side) estimating, at minimum, capital, insurance and maintenance doubles cost of gasoline alone.