📊 Fuel Economy Comparison Calculator
Put two vehicles side by side by MPG over a year's driving and see the annual fuel cost of each — plus the yearly saving of the more economical one.
🚙 Compare Two Vehicles
📊 Annual fuel cost over 12,000 miles
What is a Fuel Economy Comparison Calculator?
It translates the abstract gap between two MPG figures into the dollars it means at the pump. By holding the annual mileage and fuel price constant, the only thing that changes is efficiency — so the difference in yearly cost is entirely down to how far each car goes on a gallon.
Use it when you are cross-shopping two cars, weighing a trade-up to something thriftier, or deciding whether the fuel savings justify a pricier hybrid. It is the cost side of the MPG story that a window sticker never quite spells out.
❓ Frequently Asked Questions
How does the fuel economy comparison work?
Enter each vehicle's MPG, your yearly mileage, and the price of fuel. For each car the calculator divides annual miles by MPG to get the gallons burned, multiplies by the fuel price for the annual cost, then subtracts one from the other to show the yearly saving of the more efficient vehicle.
Is a higher-MPG car always cheaper to own?
This tool compares fuel cost only, and there a higher MPG always wins. Total cost of ownership also includes purchase price, insurance, depreciation, and maintenance — a thirstier car with a much lower sticker price can still come out ahead, so use the fuel saving as one input among several.
How much does going from 20 to 40 MPG really save?
Doubling MPG halves the gallons you buy. Over 12,000 miles a year at $3.50 a gallon, a 20 MPG car burns 600 gallons ($2,100) while a 40 MPG car burns 300 ($1,050) — a saving of about $1,050 every year, and more when fuel prices rise.
What fuel price should I enter?
Use your local average pump price for the grade each car takes. If one vehicle requires premium, price it with premium and the other with regular so the comparison reflects what you would actually pay at the pump.