Fuel for the miles you drive

How Much Does a Road Trip Cost in Gas?

Fuel cost for a drive from your miles, MPG, and the most recent EIA regular-gas average for your state or region. You can type a pump price instead.

Your numbers

Road-trip fuel cost

Miles, MPG, and a gas price. The default price is the most recent EIA weekly average for your state or region.

EIA WEEKLY GAS

Texas: $3.806/galTexas weekly average · Sep 14, 2026

Trip distancemiles

Fuel economyMPG

State

Pump price (optional)$/ galLeave blank to use the EIA average

Estimated fuel cost

$40.7810.71 gallons at $3.806

Gallons10.71300 miles ÷ 28 MPG

Cost per mile$0.136Fuel only

Price sourceEIA averageSep 14, 2026

How we got this

Gallons needed300 miles ÷ 28 MPG10.71 gal
Fuel cost10.71 gal × $3.806$40.78

What we assumed

This is highway fuel only. Tolls, food, lodging, and extra city driving are left out.
An EIA weekly average is not the price at a specific station. Type a pump price if you have one.
Real MPG changes with speed, weather, hills, and the vehicle load.

Technical details

Method road-trip-fuel-v1.0.0Data eia-gasoline-regular-weekly-2026-09-14-v1

Discrepancy in the numbers? You can click Report incorrect result below or email hello@costanswer.com with the Method and Data lines.

Guide

Fuel cost for the miles you drive

CostAnswer editorialIndependent calculator publisher

Distance ÷ MPG × dollars per gallon. The gallon price starts as an EIA weekly regular-gas average for a state or PADD region, unless you type a pump price.

Geography of the gas price

Some states have their own weekly average in the snapshot. Others inherit a PADD regional average. California and Texas often differ by more than a dollar. A trip that crosses regions is still one price unless you split the drive.

Questions about this calculator

Is highway MPG or city MPG the right input?

Use the MPG you expect on that trip. EPA combined is a compromise and often optimistic on a loaded car in hills.

Does the gas price change when I cross state lines?

Not automatically. The page uses one price (an EIA average for the geography you pick, or a pump price you type). Split the trip if you want two rates.

Terms used here

PADD: Petroleum Administration for Defense District, EIA’s regional grouping for some gasoline series.

Practical tips

Type the pump price from the start of the trip if you already know it.

Tolls, food, and lodging are not fuel. Do not treat this as a full trip budget.

Limits and caveats

Fuel only, at an average or a price you typed. Not a routing app.

Results are for information. They are not legal, tax, medical, or financial advice. How the math is maintained · Report a wrong figure.

Engine notes

Rounding, versioning, and omissions that sit beside the guide rather than repeating it.

Gallons. Trip miles divided by the MPG you enter. That is highway fuel, not a full travel budget.
A price from EIA, or yours. The default is the EIA weekly regular average for your state or PADD region as of Sep 14, 2026. A pump price you type replaces it.
Cost per mile. Fuel cost divided by miles. It ignores lodging, food, and extra city driving.

Calculation receipt

What each number here is

The arithmetic is decided by your inputs. Official data only supplies a starting value, and anything you type replaces it.

OBSERVEDEIA weekly gasoline · Sep 14, 2026: Only a starting value. A figure from your own bill or quote replaces it and is used instead.
USER ENTEREDA figure you enter: A figure you typed. It replaces our default and is used exactly as given.

Sources

Where this data comes from

U.S. Energy Information AdministrationSource: U.S. Energy Information Administration, weekly retail gasoline prices, regular all formulations. Snapshot eia-gasoline-regular-weekly-2026-09-14-v1.EIA · Sep 14, 2026 ↗