Most people know roughly what they spend on gas each month but have no idea what each mile of driving actually costs them. The difference matters more than you think, especially when comparing commute options, evaluating a job offer that requires a longer drive, or deciding whether a road trip is cheaper than flying.
The simple calculation
The basic fuel cost per mile is straightforward:
Cost per mile = Gas price / Miles per gallon
At $3.50 per gallon and 28 MPG, that is $0.125 per mile -- about 12.5 cents. A 30-mile commute each way costs $7.50 per day in fuel alone. Over 250 working days, that is $1,875 per year just in gas.
But fuel is only part of the cost of driving.
The true cost of a mile
The IRS standard mileage rate for 2024 is $0.67 per mile. That is more than five times the fuel-only cost, because it accounts for:
- Fuel: ~$0.12-0.15/mile depending on vehicle and gas prices
- Depreciation: ~$0.25-0.30/mile -- your car loses value with every mile driven
- Insurance: ~$0.05-0.08/mile when spread across annual mileage
- Maintenance: ~$0.08-0.10/mile -- oil changes, tires, brakes, everything wears proportionally to miles
- Registration and taxes: ~$0.02-0.03/mile
That 30-mile commute at the full cost rate is $40.20 per day, or $10,050 per year. Suddenly a job that pays $5,000 more but adds 20 miles to your commute is not actually a raise.
Comparing commute options
When I was evaluating a job offer that would change my commute from 12 miles to 35 miles each way, I ran the numbers:
Current commute (12 miles each way):
- 24 miles/day * 250 days * $0.67/mile = $4,020/year
- Time: 25 minutes each way = 208 hours/year
New commute (35 miles each way):
- 70 miles/day * 250 days * $0.67/mile = $11,725/year
- Time: 50 minutes each way = 417 hours/year
The difference: $7,705 per year in driving costs and 209 additional hours in the car. To break even financially, the new job needed to pay at least $7,705 more. And if I valued my time at even $25/hour, the commute time cost another $5,225 in opportunity cost. Total: the new job needed to pay roughly $13,000 more just to break even with the commute change.
Electric vehicle economics
EVs change the fuel calculation significantly:
Electricity cost per mile = (kWh per mile) * (electricity rate)
A typical EV uses about 0.30-0.35 kWh per mile. At the US average electricity rate of $0.16/kWh, that is about $0.05 per mile -- roughly one-third to one-half of gasoline cost per mile.
But EVs are not free of the other costs. Depreciation on EVs is currently higher than gasoline vehicles (though this is changing), tire wear is often higher due to the extra weight, and while maintenance is lower (no oil changes, simpler drivetrain), it is not zero.
Road trip vs flying
For a 500-mile trip, the fuel cost alone might be $22 (500 miles / 28 MPG * $3.50). A flight might cost $150. The fuel math makes driving look cheaper, but factor in:
- Wear and tear: 500 miles * $0.67 = $335
- Time: 8 hours of driving vs 1.5 hours of flying (plus airport time)
- Tolls: varies by route but can add $20-50
For solo travelers, driving short distances (under 300 miles) usually wins. For longer trips or multiple travelers sharing a car, the breakeven point shifts. Four people driving 500 miles split the $335 cost four ways ($84 each), which beats most flights.
I built a fuel cost calculator at zovo.one/free-tools/fuel-cost-calculator that takes your vehicle's MPG, current gas prices, and trip distance to calculate both the fuel cost and the estimated total cost per mile. Useful for commute comparisons, road trip budgeting, and any situation where you need to know what driving actually costs.
I'm Michael Lip. I build free developer tools at zovo.one. 500+ tools, all private, all free.
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