Compare annual fuel costs between two vehicles to calculate fuel savings. See how much you save switching to a more efficient car.
Considering a new vehicle? One of the biggest factors in total cost of ownership is fuel. This calculator compares the annual fuel costs of two vehicles side by side, showing you exactly how much you'd save (or spend) by switching.
The difference can be dramatic. Upgrading from an 18 MPG truck to a 35 MPG sedan at $3.50/gallon saves over $1,400 per year. Over a typical 7-year ownership period, that's nearly $10,000 in fuel savings alone — potentially covering the cost difference between vehicles.
This tool helps you make informed purchase decisions by quantifying fuel savings in dollars, not just MPG numbers. It also accounts for different driving distances, since commuters save more than weekend drivers.
Whether you drive a compact sedan, a full-size SUV, or a pickup truck, accurate fuel savings vehicle comparison figures help you plan smarter and avoid costly surprises at the pump or dealership. Use this tool regularly to track changes over time and adjust your transportation budget accordingly.
MPG numbers alone can be misleading. A 5 MPG improvement at 15 MPG saves far more fuel than the same improvement at 35 MPG. This calculator converts MPG differences into actual dollar savings, giving you the real financial picture for vehicle comparisons. Results update instantly as you adjust inputs, making it easy to explore different scenarios and find the best option for your driving needs and budget.
Annual Savings = Annual Fuel Cost(Vehicle A) − Annual Fuel Cost(Vehicle B) Where Annual Fuel Cost = (Annual Miles ÷ MPG) × Fuel Price
Result: $885 saved per year
Vehicle A (22 MPG): 15,000/22 × $3.50 = $2,386/yr. Vehicle B (35 MPG): 15,000/35 × $3.50 = $1,500/yr. Annual savings = $2,386 − $1,500 = $886.
Fuel is typically the second-largest expense of vehicle ownership after depreciation. Over a typical ownership period of 7 years, fuel costs can total $10,000–$20,000 or more. Choosing a vehicle with better fuel economy can save thousands.
SUV (22 MPG) vs Sedan (32 MPG): Save $750/year. Truck (18 MPG) vs Hybrid (50 MPG): Save $2,030/year. Old car (20 MPG) vs New car (30 MPG): Save $875/year. All figures based on 15,000 miles and $3.50/gallon.
If the more efficient vehicle costs $3,000 more but saves $900/year in fuel, the payback period is 3.3 years. For a cost difference of $5,000, you need 5.6 years. Most people own vehicles for 6–8 years, so moderate price premiums for efficiency usually pay off.
While this calculator focuses on fuel, remember that total ownership cost also includes insurance, maintenance, depreciation, financing, and registration. Sometimes a cheaper vehicle with worse fuel economy still costs less overall.
It depends on the MPG difference and your driving. Going from 20 to 30 MPG saves about $875/year at $3.50/gal over 15,000 miles. From 15 to 30 MPG, savings jump to $1,750/year. Over a 7-year ownership period, these savings are $6,125 and $12,250 respectively.
Usually not if your current car is reliable. The purchase price, taxes, and depreciation of a new car often exceed fuel savings. However, if you're already buying, choosing the efficient option makes clear financial sense.
This is the MPG illusion. Going from 15 to 20 MPG saves 16.7 gallons per 500 miles. Going from 35 to 40 MPG saves only 1.8 gallons per 500 miles. The relationship between MPG and fuel consumption is not linear — it's an inverse curve.
Match the MPG type to your driving. Commuters doing mostly stop-and-go should use city MPG. Road trippers should use highway MPG. For mixed driving, the EPA combined rating is best. Actual tracked MPG is always the most accurate.
Higher fuel prices amplify the savings of choosing the more efficient vehicle. If gas goes from $3.50 to $4.50/gallon, annual savings between a 22 and 35 MPG vehicle jump from $886 to $1,138 — a 28% increase in savings.
This tool compares two gas vehicles using MPG. For gas vs. EV comparisons, use our EV vs Gas Cost Comparison calculator, which accounts for electricity rates and different efficiency metrics.