Skip to content
PlainTotal
Auto

Gas Cost Calculator

Fuel cost for a drive comes down to three numbers: how far you are going, how many miles your vehicle gets per gallon, and what a gallon costs where you are filling up.

Last updated Free, no sign-upHow it works

Your inputs
Your drive
Location

Optional. Picks the published price for your state; otherwise the US average is used.

Why we ask

A ZIP code is matched to its state with published postal prefix ranges and used only to look up that state’s row in a federal price table. We never ask for a street address, nothing is stored, and your inputs appear only in this page’s URL.

Results update as you type. Nothing you enter is sent anywhere or stored.

Fuel cost for this drive: $40, ranging from $35 to $48.

Fuel cost for this drive

medium confidence
$40One way, 300 miles
$35 lowhigh $48
  • United States average
  • Assumptions 2026.07.1

Why medium: no state was resolved, so national averages were used; the modeled range spans about 33% of the typical value.

Key figures

Gallons of fuel
9.7
Fuel cost per mile
$0.13
Price per gallon used
$4.16
Fuel economy used
31Combined city and highway.
Same distance at the IRS mileage rate
$22876.0 cents a mile covers fuel, maintenance, insurance, and depreciation — not fuel alone. It is what a business could deduct for this drive.

Cost breakdown

Estimated cost of each component, with low, typical, and high values.
ComponentLowTypicalHigh
Fuel for 300 milesEnergy9.7 gallons at $4.157/gal.$35$40$48
Fuel cost for this drive$35$40$48

The low and high columns above will not add up to the headline range. Each line has its own uncertainty, and every line landing at its worst case at the same time is unlikely, so the total combines them as partially independent rather than summing the extremes.

How this number was produced
  1. Distance300 mi300 mi
  2. Gallons needed300 mi ÷ 31 MPG9.7 gal
  3. Fuel cost9.7 gal × $4.157$40.23

Adjustments applied

  • Midsize sedan×1.00

    31 MPG against a 31 MPG midsize sedan baseline.

  • Fuel price×1.00

    United States average of $4.157/gal (EIA, Week of 2026-09-07).

Notes and sources3 notes, 2 sources

Worth knowing

  • Gasoline prices move week to week and vary by several dimes between stations in the same city. This uses the most recent published weekly average for your state or region — if you know the price at your pump, enter it and the answer sharpens considerably.
  • The range reflects how far real fuel economy strays from the rating. Cold weather, short trips, roof racks, heavy loads, aggressive acceleration, and highway speeds above about 65 mph all push consumption toward the high end.
  • This is fuel only. It does not include tolls, parking, or the wear the miles put on the vehicle.

Sources

  • U.S. Energy Information Administration, Weekly Retail Gasoline and Diesel Prices — regular grade, all formulations, by region and selected stateprimaryWeek of 2026-09-07retrieved 2026-09-11
  • Fuel economy anchored to the U.S. EPA Automotive Trends Report (model year 2024 real-world values); ownership cost components compiled from IRS Notice 2026-10 and IR-2026-29 standard mileage rates, U.S. DOE Alternative Fuels Data Center guidance, and editorial baselines where no agency publishes a figuremixed2026retrieved 2026-07-31

This calculator uses the Energy Information Administration’s current weekly price for your state or region, and shows a range rather than a single figure because real fuel economy rarely matches the sticker.

Methodology

How this calculator works

Where the price comes from

The Energy Information Administration publishes a retail gasoline price every Monday. It covers the nation, each Petroleum Administration for Defense District sub-region, and nine individual states: California, Colorado, Florida, Massachusetts, Minnesota, New York, Ohio, Texas, and Washington.

If you choose one of those nine, you get a state figure. Everywhere else gets its regional figure, which is the finest geography EIA publishes. The result says which of the two applied, because a Gulf Coast average covers six states and is a rough proxy for any one of them.

Why the answer is a range

A vehicle’s combined rating is measured on a standardised test cycle. Real driving departs from it constantly, and the departures are mostly in one direction. Sustained highway speeds, cold starts, short trips, roof boxes, underinflated tyres, and a heavy right foot all cost fuel.

The low end of the range assumes conditions favour you: warm weather, steady speeds, light load. The high end assumes they do not. If you have tracked your own economy over several tanks, entering it directly is far better than any class average.

Location and data

Where the numbers come from

Location is optional, and we only ask for a ZIP code or a state — never a street address. A ZIP code is matched to its state using published postal prefix ranges, and that state is used to look up labor and price rows in the tables below. If you leave it blank, or your ZIP cannot be matched, the estimate falls back to a national average and says so on the result.

Nothing you enter is transmitted or stored. The calculation runs entirely in your browser, and the only place your inputs appear is in the page URL, so you can bookmark or share a result if you choose to.

  • primaryWeek of 2026-09-07v2026.09.1

    U.S. Energy Information Administration, Weekly Retail Gasoline and Diesel Prices — regular grade, all formulations, by region and selected state

    EIA publishes weekly retail gasoline prices for the nation, for each Petroleum Administration for Defense District (PADD) sub-region, and for nine individual states. States EIA does not publish separately take their PADD sub-region price, which is the finest published geography available; every result discloses which of the two applied. Prices are a weekly snapshot and move faster than any other figure on this site, so every calculator that uses them lets you type in the price you actually paid.

  • mixed2026v2026.07.1

    Fuel economy anchored to the U.S. EPA Automotive Trends Report (model year 2024 real-world values); ownership cost components compiled from IRS Notice 2026-10 and IR-2026-29 standard mileage rates, U.S. DOE Alternative Fuels Data Center guidance, and editorial baselines where no agency publishes a figure

    Two numbers here come straight from the EPA: the model year 2024 fleet-wide real-world average of 27.2 MPG and the truck SUV average of 25.7 MPG. The other class averages are editorial estimates positioned around those published anchors, and every one of them describes a NEW vehicle — the average vehicle actually on the road is roughly twelve years old and less efficient, which is why each class carries a range rather than a point. Depreciation, maintenance, tires, and registration are assumptions: no federal agency publishes them per vehicle, and the commercial datasets that do are licensed products we have not bought. Each is registered in the assumption registry with its observed range and rationale, and each is adjustable in every calculator that uses it.

Full detail on every dataset is on the data sources page. Spotted something wrong? Report incorrect data.

Calibration

The judgements behind this estimate

These are the figures we chose rather than measured. For each one we record the range of values found across references, what we selected, and why — because an estimate you cannot interrogate is not much better than a guess. The 1 marked high risk are the ones most likely to be wrong and most consequential when they are.

  • Maintenance, repairs, and tires per mile by vehicle agehigh risklow confidence
    Observed range
    0.04 — 0.26 (typical 0.1)dollars per mile
    Why this value
    Three age bands rather than one figure, because upkeep roughly triples per mile between a nearly-new vehicle and one past ten years old. The typical value shown here is the mid-life band, which covers vehicles four to nine years old. Excludes collision damage and excludes fuel.
    Applies to
    Not modeled regionally, though labor rates for repair work follow the same pattern as other trades.
    Known limits
    These are multi-year averages, not predictions for any particular month. Real maintenance spending is lumpy: nothing for months, then a component failure. The high end of the older-vehicle band is where those years land.
    Sources
    No federal agency publishes vehicle maintenance cost per mile; the commercial datasets that do are licensed products not used here; Cross-checked for plausibility against the IRS business standard mileage rate, which is an all-in federal figure covering this among other costs
    Last verified
    2026-07-31 · reviewed annual
  • Real-world fuel economy by vehicle classmedium confidence
    Observed range
    15 — 48 (typical 27.2)miles per gallon, combined
    Why this value
    Two of the eight class figures are published: the EPA Automotive Trends Report gives a model year 2024 fleet-wide real-world average of 27.2 MPG and a truck SUV average of 25.7. The remaining six are positioned around those anchors so the volume-weighted mix reproduces the published fleet average. Every class is a band rather than a point, because a rating is a test-cycle result and real driving departs from it in one direction.
    Applies to
    Not regionally variable, though cold-climate states see materially worse real-world economy in winter.
    Known limits
    These are NEW vehicle averages. The average vehicle on the road is roughly twelve years old and less efficient, so a user with an older car should enter their own MPG. Six of the eight classes are not individually published.
    Sources
    U.S. EPA Automotive Trends Report, model year 2024 (published February 2026) — fleet average 27.2 MPG, truck SUV 25.7 MPG; Remaining class values are editorial estimates anchored to the two published figures
    Last verified
    2026-07-31 · reviewed annual

Cost factors

What changes the price most

Distance
Directly proportional. Doubling the drive doubles the fuel.
Fuel economy
The other half of the equation. A pickup at 21 MPG uses half again the fuel of a sedan at 31 for the same trip.
Local price
Varies by nearly two dollars a gallon between the cheapest and most expensive states, mostly because of state fuel taxes and refinery access.
Speed
Not modeled directly, but significant. Most vehicles lose about 15% of their economy going from 65 to 75 mph, because drag rises with the square of speed.
Fuel grade
Premium runs 60 to 90 cents above regular. Only worth it if the manual requires rather than recommends it.
Load and terrain
Not modeled. A loaded roof rack can cost 10% to 25% at highway speed, and mountain driving costs more than the map distance suggests.

Questions

Frequently asked

How much gas will I use on a 300 mile trip?

A midsize sedan at about 31 MPG uses roughly 10 gallons, costing about $41 at the current national average. A pickup at 21 MPG uses around 14 gallons for the same trip. Enter your own distance and vehicle above for a figure that reflects your state’s price.

How do I calculate gas cost for a trip?

Divide the distance by your vehicle’s miles per gallon to get gallons, then multiply by the price per gallon. The arithmetic is simple; getting a realistic MPG figure and a current local price is the part that actually determines whether the answer is any good.

Is premium gas worth the extra cost?

Only if your owner’s manual requires it. Where premium is merely recommended, engines run safely on regular by retarding ignition timing, at a small cost in power and economy that almost never repays the 60 to 90 cent price gap. Where it is required, using regular can cause knock and long-term damage.

Why is gas so much more expensive in California?

Three reasons stack up: the highest state fuel taxes in the country, a mandatory cleaner-burning fuel blend that only a handful of refineries produce, and an isolated fuel market with limited pipeline connection to the rest of the country. Together they typically put California well over a dollar above the national average.

Does driving slower really save gas?

Yes, and more than most people expect. Aerodynamic drag rises with the square of speed, so it dominates above roughly 50 mph. Dropping from 75 to 65 mph typically recovers 10% to 15% of your fuel — on a 600 mile drive that is often more than an hour’s wages.