Road Trip Budget: Fuel, Tolls, Rooms and a Fair Split

What a road trip costs

Most of a road trip budget falls into three groups. Knowing which group a cost belongs to tells you how to price it and, later, who pays for it.

The car costs are what make a road trip different from a trip by plane or train. They depend on the route, not on how many people come along, so every extra passenger makes each share smaller. Rooms and food work the other way round: they grow with the group.

Step 1: Fix the route and the driving days

Every number below starts with two figures: the total miles and the number of nights on the road.

• Total miles. Take the route distance from your map app, there and back if you return the same way. Then add the miles you will drive at the destination: trips to trailheads, a day out to a lake, the drive to dinner. Those local miles are easy to forget and add up over several days.
• Detours and stops. If you plan a scenic road or a sight off the highway, add those miles too. A short note with the extra distance for each detour keeps the total honest.
• Driving days. Decide how many hours you want to drive each day, and with how many drivers. That sets how far you get before the next night, and so how many nights you pay for on the way. A long route in one day saves a room but leaves no slack if you hit traffic.
• One way or a loop. If you rent a car for a one-way trip, ask whether the rental company charges extra for returning it somewhere else, and get it in the quote before you compare routes.

Step 2: Fuel, priced for your route

The fuel math itself is simple: miles ÷ mpg × price per gallon. The trip fuel cost calculator does it in miles or kilometers, explains the formula and shows how much your car's fuel economy changes the result. The part people get wrong is the price.

For a current price, use the US Energy Information Administration (EIA). It publishes average retail prices for regular gasoline every week, for the US as a whole, for regions, and for some states and cities. For the week of October 19, 2026, the US average was $4.284 a gallon. The regions were far apart. Here is what the same 1,100-mile trip in a 30 mpg car costs at those prices:

That is a gap of $82 for the same car on the same distance, only because of where you buy the fuel. Prices also move from week to week, so a price you looked up a month ago may be off. The EIA releases new figures each week.

A route through more than one region

If the route crosses regions, split it. Say 700 of the 1,100 miles run through the Gulf Coast region and 400 through the Rocky Mountain region:

• 700 ÷ 30 × $3.784 = $88.29
• 400 ÷ 30 × $4.468 = $59.57
• Together: $147.87, against $157.08 at the US average.

Run the trip fuel cost calculator once per region, or once with a price between the two if most of the miles fall on one side. Enter the fuel economy your car really gets with a full load. The calculator page shows what fueleconomy.gov says about speed, roof boxes and tires.

Step 3: Tolls and parking

Tolls are easy to leave out because you do not see them on a map until you drive the road. Look them up before you go:

• Use the toll operator's own calculator. Many toll roads publish one. The Pennsylvania Turnpike, for example, says its toll calculator takes the entry and exit points, the vehicle class and the payment method into account.
• Check how you will pay. The payment method can change the price. On the Pennsylvania Turnpike in 2026, the most common passenger car toll is $1.94 with a transponder and $3.88 when the turnpike bills you by license plate. The turnpike says transponder customers save 50% compared with the plate rate. Other roads have their own rules, so check each one on your route.
• Ask the rental company. If you rent the car, ask how it bills tolls you drive through and whether it adds its own fee on top, and get the answer before you leave the lot.

Parking is the other quiet cost. Ask the hotel whether parking is included or charged per night, and look up parking at the places you plan to visit. Count it per night for the hotel and per visit for the sights.

Step 4: Rooms, food and a buffer

The rest of the budget works like any trip. The travel budget calculator takes each cost with the way it counts (per room per night, per person per day, once per trip), adds a buffer and gives you the total per person and per day. Its page also has a checklist of costs that are easy to forget, such as resort fees, and explains how to choose the size of the buffer, so this guide does not repeat it.

Two road-trip points to add in the calculator:

• Enter the car costs as one-time lines. Put fuel and tolls in as per-trip amounts from steps 2 and 3, and hotel parking per night.
• Count the rooms you really need. A group of four may need two rooms or three, depending on who shares. The room count changes the total more than most other choices.

A worked example

Four friends drive 1,100 miles in Ana's car, which gets 30 mpg. They are away 3 nights (4 days). Ben and Ana share a room; Cleo and Dev each want a room of their own, so they book 3 rooms. The fuel price is the EIA US average from step 2. The other amounts are example figures: replace them with your own quotes.

That is $703.20 per person on average, or $175.80 per person per day. The car itself, fuel plus tolls plus parking, comes to $247.08 for the whole trip: $0.22 a mile for the car, and a quarter of that for each of the four.

Splitting the costs in the car

An average per person is fine for planning, but it is rarely what each person should pay. In the example, Cleo and Dev each have a room to themselves, so a flat four-way split would make Ana and Ben pay for part of their rooms. A common way to split it:

• Car costs (fuel, tolls, parking): equally among everyone in the car, the driver included.
• Rooms: each room among the people sleeping in it.
• Food and tickets: each person pays their own, or the group keeps a shared kitty for shared meals.

Applied to the example, before the buffer:

The four totals add up to the $2,557.08 subtotal above, so nothing is lost or counted twice. With the 10% buffer on top, Ana and Ben should plan for about $579.45 each, and Cleo and Dev for about $826.95.

When the split is not equal

• Someone joins for part of the way. Split the car costs by the miles each person rides. The carpool cost splitter does this, along with an equal split or an agreed rate per mile, and makes the shares add up to the cent.
• Two cars. Work out each car's costs on its own, with its own mpg, then split each car among its passengers. If people switch cars along the way, pool both cars' costs and split the total among everyone.
• The driver. Some groups count the driver in the split, some let the driver ride for free in return for the driving or the use of the car. Either is fine as long as everyone agrees before you leave.

Settle up with one person keeping the receipts for fuel, tolls and parking, so the split uses what you really paid, not the estimate.

Electric car instead of gas

For an electric car, the fuel line becomes charging: kWh per mile times the price per kWh. Home charging is billed at your home rate, while public fast chargers along a highway set their own prices, so look up the price at the stations on your route. The EV vs gas car cost per mile guide compares the two with official ratings and prices, and the EV charging cost calculator works out a home and a public price for your car.

To find chargers on the way, the Department of Energy's Alternative Fuels Data Center runs a free station locator for the US and Canada, with an option to map a route. Plan the charging stops when you plan the driving days, since a stop also takes time out of the day.

Wear and tear, and what the IRS mileage rate is

Fuel is not the only cost of driving a car. Tires, oil changes and other upkeep wear with every mile, and the car loses value. That is why some groups pay the driver more than the fuel.

The number people often reach for is the IRS standard mileage rate: 76 cents a mile for business driving from July 1 to December 31, 2026, and 72.5 cents before that. It helps to know what it is and what it is not:

• What it is. An optional rate for working out tax deductions for business, charity, medical and military moving miles. The IRS says the business rate is based on an annual study of the fixed and variable costs of operating a car, and the medical and moving rate on the variable costs only.
• What it is not. It is not a measure of what your car costs on your trip, and it is not a rule for splitting costs among friends. It is an average across cars, and it covers fixed costs as well as the costs of driving.

The IRS mileage rate 2026 guide explains the rates and who can use them, and compares them with what a car really costs. If your group wants to cover wear on the car, work out your own figure in the cost per mile calculator and agree on a per-mile rate in the carpool cost splitter. Splitting fuel, tolls and parking only is just as fair, as long as the group agrees on it.

Driving across the border

A road trip from the US into Canada changes two things in the fuel line: the unit and the currency. Statistics Canada reports retail gasoline prices in cents per litre, in Canadian money. Switch the trip fuel cost calculator to kilometers and liters per 100 km for that part of the route. A 30 mpg car uses about 7.8 liters per 100 km; the fuel economy converter does the conversion for any figure.

Convert the result back into your home currency with the currency converter, and remember that your card or bank may use a different rate and charge fees. If a card terminal offers to charge you in your home currency, the dynamic currency conversion guide explains what that choice costs.

Before you leave

• Look up the fuel price for your route again in the week you leave, and update the budget.
• Check every toll road on the route and how you will pay it.
• Confirm hotel parking and any rental car fees in writing.
• Agree on the split rule and who keeps the receipts.
• Make a packing list. The free printable packing list lets you pick the kind of trip, add your own items and print it as a PDF.

Back home, compare what you spent with the budget. The difference tells you how to set the numbers, and the buffer, next time.

Frequently asked questions

Sources

• US Energy Information Administration, Gasoline and Diesel Fuel Update, retail prices for the week of October 19, 2026 (released October 20, 2026)
• Pennsylvania Turnpike Commission, 2026 toll schedule takes effect this weekend (January 7, 2026)
• IRS, Standard mileage rates
• IRS, IR-2025-128: IRS sets 2026 business standard mileage rate at 72.5 cents per mile, up 2.5 cents
• US Department of Energy, Alternative Fuels Data Center, Station Locator
• Statistics Canada via Open Government Portal, Monthly average retail prices for gasoline and fuel oil, by geography

General information based on the sources above, not tax, legal or financial advice.

Written by Tobias. Updated October 21, 2026.