Compare & Save
Fuel Savings Calculator
The Fuel Savings Calculator shows exactly how much money a more efficient vehicle puts back in your pocket. By comparing two MPG ratings side by side, you can see the real cost difference between the car you have and the car you are considering — or between two trims of the same model.
Enter the MPG of Vehicle A and Vehicle B, your annual mileage, and the current gas price. The tool computes the yearly fuel cost for each vehicle, then reports your annual savings, your 5-year savings, and the number of gallons saved per year. These numbers turn an abstract MPG difference into dollars you can actually plan around.
This is one of the most useful calculations when deciding whether a hybrid, a smaller engine, or a newer model is worth the higher sticker price. High-mileage drivers — commuters, rideshare drivers, and road-trippers — recover an efficiency upgrade far faster than someone who barely drives. The gallons-saved figure also highlights the environmental benefit, since fewer gallons burned means lower emissions. Remember that the 5-year total assumes today’s gas price holds steady; if prices climb, your real-world savings will be even greater. Combine this with our other tools to build a complete picture of your driving costs before making a purchase decision.
How to Use
- Enter the MPG of Vehicle A (your current or baseline car).
- Enter the MPG of Vehicle B (the more efficient option).
- Enter your annual mileage.
- Enter the current gas price per gallon.
- Click Calculate Savings (or press Enter) to see annual and 5-year savings.
Related tools: MPG Calculator, Trip Cost Calculator, Fuel Cost Calculator.
Got Questions?
Fuel Savings Calculator FAQ
It calculates the annual fuel cost for two MPG ratings using your annual mileage and gas price, then subtracts to show how much the more efficient vehicle saves you each year and over five years.
It depends on the price difference and how many miles you drive. High-mileage drivers recover the cost of a more efficient car much faster. Use the annual and 5-year savings figures here to compare against the price gap.
At 15,000 miles/year and $3.50/gal, going from 25 to 30 MPG saves roughly $350 per year. Enter your own numbers above for an exact figure.
No. The 5-year total simply multiplies the annual savings by five at today’s gas price. If prices rise, your real savings would be larger.
Annual miles is the total distance you drive in a year. The average US driver covers about 13,000–15,000 miles annually, but use your own commute and travel habits for accuracy.