How do I calculate my actual fuel cost per mile?

Divide your total fuel spending by the miles you drove during the same period. For example, if you spent $180 on fuel over the past month and drove 1,200 miles, your fuel cost per mile is $0.15. For an EV, divide your total charging cost by the miles driven. This household-specific number is more useful for budgeting than national averages or EPA label figures, which are standardized comparison tools and not guarantees of what any individual driver will experience.

Should I fix my car or replace it?

There is no universal formula. A rule like replace the car if the repair exceeds 50 percent of its value is not a federal standard and is often too simplistic. Consider the vehicle's current condition, the type of repair needed, whether it addresses a safety issue, the expected remaining useful life after repair, the cost of a replacement vehicle including financing and insurance, the household's current financial position, reliability requirements, and available transportation alternatives. The repair-or-replace decision is household-specific and benefits from actual ownership records rather than rules of thumb.

Is an electric vehicle practical for my household?

The answer depends on several household-specific factors. The Department of Energy recommends considering daily mileage, longer trip frequency, home charging availability, workplace or public charging access, and connector compatibility. Level 1 charging using a standard outlet may meet some drivers' needs. Level 2 may be needed for longer daily driving or larger batteries, but requires evaluating electrical capacity, code compliance, permitting, and potentially hiring a qualified electrician. EV fit is a practical question, not an ideological one, and the answer varies by household.

Home Self-Reliance Planning Household Management Transportation and Vehicle Ownership Operating Cost, Breakdowns and the Ownership Record

Transportation and Vehicle Ownership · Chapter 6

Operating cost, breakdowns and the ownership record

What the vehicle costs, what to do when it stops, and how to track it all so the next decision is made with data instead of panic.

Household numbers

Calculate what the vehicle actually costs

The most useful vehicle-cost number is the one calculated from your own driving, not a national average. For a gasoline or diesel vehicle, divide your fuel spending by the miles you drove during the same period. For an EV, divide your total charging cost by miles driven. These give you your actual energy cost per mile.

The household cost-per-mile calculation

Gasoline or diesel: Fuel dollars spent / miles driven = fuel cost per mile

Electric: Charging dollars spent / miles driven = charging cost per mile

Example: $180 in fuel / 1,200 miles = $0.15 per mile in energy cost

Energy is only one category. Total household vehicle cost can include the loan or lease payment, insurance, registration and taxes, fuel or electricity, scheduled maintenance, tires, unplanned repairs, parking and tolls, and roadside-service coverage. Not all of these hit in the same month, but they all hit the same budget. Tracking them in the vehicle record turns transportation from a vague expense into a known number.

EPA labels are comparison tools, not guarantees

EPA fuel-economy labels use standardized testing designed to reflect a range of real-world conditions. Actual mileage varies by driving behavior, weather, road conditions, vehicle condition, and other factors. Use the labels to compare two vehicles against each other on even terms. Use your own fuel or charging records to measure what transportation actually costs your household.

Electric vehicle fit

EV ownership starts with daily use

The Department of Energy's Alternative Fuels Data Center recommends considering daily mileage, longer trip needs, home charging access, workplace or public charging availability, and connector compatibility when evaluating whether an EV fits a household. An EV that covers daily commuting and errands easily on a nightly charge may be an excellent fit. An EV that requires frequent public charging stops and does not have reliable access to compatible stations nearby is a different proposition.

Home charging

DOE notes that many EV owners charge at home. Level 1 charging using a standard household outlet may meet some drivers' needs, particularly for shorter daily mileage. Level 2 charging may be useful for longer daily driving, larger batteries, and shorter charging windows. Level 2 installation is an electrical project: DOE advises that electrical capacity must be evaluated, equipment should meet applicable safety requirements, local and state codes apply, permits may be required, and qualified electrical installation may be needed. Treat Level 2 as a code-sensitive electrical installation, not as plugging in an appliance.

Public charging

For EV ownership, record your vehicle's compatible connector types, your home charger details, any workplace charger access, nearby public charging locations, typical long-trip charging options, and the pricing model for public chargers you use regularly. Charging infrastructure and connector adoption continue to change. Do not treat any current station count or connector standard as permanently settled.

EV fit is practical, not ideological

An EV may be an excellent, adequate, or poor match for a specific household's daily mileage, charging access, travel patterns, and electrical situation. The evaluation is the same kind of requirement-matching used for any vehicle decision. Let the household's actual needs determine the answer rather than starting with a conclusion and working backward.

Ordinary breakdowns

Prepare for the day the vehicle stops

Vehicles break down. The question is not whether but when, and whether the household is prepared to handle it as an inconvenience rather than a crisis. Preparation has two parts: carrying basic equipment and knowing how to get help.

The ordinary roadside kit

NHTSA's seasonal driving guidance recommends an emergency roadside kit. A sensible baseline includes a phone and charging cable, a flashlight with fresh batteries, warning devices such as reflective triangles or flares, a basic first-aid kit, a tire-pressure gauge, jumper cables or a portable jump starter, gloves, basic tools, and drinking water. Tailor the kit to your vehicle, season, geography, and driving conditions. A winter kit in a northern climate needs different additions than a summer kit in the desert.

The vehicle's emergency kit page covers more detailed builds, seasonal additions, and gear recommendations.

Know your roadside-assistance route

Roadside assistance may come from automobile insurance, the vehicle manufacturer's warranty, a motor club membership, a credit-card benefit, or a standalone towing service. Record the provider name, phone number or app, membership or policy number, and any towing-distance limit. Do not assume roadside assistance is included with insurance or the vehicle unless you have verified it.

Location safety overrides mechanical ability

A driver who knows how to change a tire may still be in a location where doing so is unsafe: narrow shoulder, high-speed traffic, poor visibility, soft ground, bad weather, or limited personal mobility. The safest repair may be calling for help. Carrying tools does not create an obligation to use them in every situation. The roadside kit supports basic tasks and access to help. It does not turn the driver into a roadside mechanic.

Winter stalls

NHTSA advises drivers stalled in severe winter conditions to remain focused on occupant safety, make the vehicle visible, manage carbon monoxide risk by keeping the exhaust clear if the engine is used, and avoid prolonged engine running in an enclosed area. Detailed winter preparedness and disaster-level stranding belong in the winter driving section. This chapter covers the ordinary breakdown: the flat tire, the dead battery, the overheating engine on a Tuesday afternoon.

Track and decide

The ownership record and the replacement decision

A vehicle ownership record tracks what has been done, what it cost, what is coming next, and whether the vehicle is still serving the household well. Without it, every repair decision is made from memory and emotion. With it, patterns emerge: a vehicle that averages $200 per month in unplanned repairs over the past year is telling you something different from one that needed a single $800 repair after 60,000 trouble-free miles.

Category	What to track
Maintenance	Date, mileage, service performed, cost, next due
Tires	Make and size, install date, install mileage, rotation dates, tread status, age
Recalls	Date checked, any open recalls, repair completion date
Repairs	Problem described, diagnosis, cost, days the vehicle was unavailable
Fuel or charging	Miles driven, gallons or kWh purchased, cost
Legal	Registration renewal, inspection due, insurance renewal

The repair-or-replace decision

A rule like "replace the car if the repair exceeds 50 percent of its value" is not a federal standard. It is a rough heuristic that ignores too many variables to be universally useful. A $3,000 transmission repair on a vehicle worth $6,000 might be smart if the rest of the vehicle is solid and a replacement would cost $15,000 plus higher insurance. The same repair on a vehicle with failing brakes, an aging engine, and mounting electrical problems might be money thrown after a vehicle that is done.

Consider the vehicle's overall condition, the nature of the repair (is it a one-time fix or a symptom of broader decline?), whether the issue is safety-related, the expected remaining useful life after repair, the realistic cost of a replacement including financing and insurance changes, the household's current financial position, reliability requirements, and available alternatives. The ownership record provides the data this decision needs.

The annual transportation review

At least periodically, step back and ask the bigger questions. Does the household still need this vehicle? Is it reliable? Is it safe? Is it maintained? What major maintenance is approaching? What is transportation costing? Are transportation needs changing? Would a different mix of vehicle, transit, and other options serve the household better? The review does not have to be formal. It has to happen. Vehicles age, households change, and the transportation system that made sense three years ago may not make sense today.

Connected guides

Preparedness

Where this guidance comes from

EPA, Fuel Economy, accessed 2026-08-11.
EPA, Fuel Economy Label, accessed 2026-08-11.
DOE Alternative Fuels Data Center, Electric Vehicles for Consumers, accessed 2026-08-11.
DOE AFDC, Charging Electric Vehicles at Home, accessed 2026-08-11.
NHTSA, Summer Driving Tips (roadside kit), accessed 2026-08-11.
NHTSA, Winter Driving Tips, accessed 2026-08-11.