Commuting Math: What Your Drive to Work Really Costs in Gas
Your commute is the most repeated cost you have, and most people never total it. A few real numbers show whether that distant apartment is quietly costing you hundreds a month.
Key takeaways
- A 30-mile round trip at 25 mpg costs roughly $130–$160 a month in gas.
- Moving 10 miles closer can save real money without changing your car.
- Tire pressure and smooth driving are free mpg you are leaving behind.
- Carpooling two days a week cuts the bill by about 40%.
The formula you can do in your head
Gas cost is just (miles ÷ mpg) × price. A 30-mile round-trip commute is 660 miles a month. At 25 mpg that is 26 gallons; at $3.25 a gallon, about $85. But most people also run errands, so the real commute-adjacent bill often lands $130–$160 a month. Check your own car against local prices in our <a href="/calculators/fuel-cost/">fuel cost calculator</a>.
What a longer commute really costs
| Round trip | Monthly miles | Monthly gas @25mpg, $3.25 |
|---|---|---|
| 10 miles | 220 | $29 |
| 30 miles | 660 | $86 |
| 50 miles | 1,100 | $143 |
| 80 miles | 1,760 | $229 |
The rent-vs-gas tradeoff nobody runs
Paying $200 more in rent to live 20 miles closer can be cheaper than the gas, wear, and time of the longer commute. Add depreciation from the extra miles and the closer place often wins.
The free mpg you are ignoring
- Keep tires at the door-jamb pressure, not the sidewall max.
- Ease off the gas; hard acceleration burns fuel for nothing.
- Combine errands into one warm trip instead of cold starts.
- Lighten the trunk — extra weight costs mpg.
When an EV commute changes the math
If most of your miles are a predictable commute, home charging flips the cost. At about $0.16 per kWh and 3.5 miles per kWh, that same 660 monthly miles costs roughly $30 instead of $85. Public fast charging erases the savings, so it only works if you plug in at home. Compare the two in our <a href="/calculators/ev-vs-gas-cost/">EV vs gas cost calculator</a>.
Frequently asked questions
How much does a 30-mile commute cost in gas?+
Does moving closer to work actually save money?+
What is the cheapest way to lower commute fuel cost?+
How do I track my real commute cost?+
Calculate fuel costs for any trip or annual driving. Compare gas prices, MPG, and distance to budget accurately.
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