MPG Savings Calculator
Compare two cars side by side. Pick them from the official EPA list (or type the MPG) and see what each one costs in gas per year and over the years you’ll own it. I think yearly cost is a far more useful number than MPG, because it shows in dollars what a better car is really worth to you.
Gas mileage: U.S. EPA (FuelEconomy.gov) · Gas price: EIA weekly average · By Nathan Brooks
Compare fuel costs
Car A (your current car)
Pick a car or type the MPG.
Car B (the one you’re considering)
Pick a car or type the MPG.
Your driving
The U.S. average is roughly 12,000–13,500 miles.
Default: this week’s U.S. average for regular.
To see how long it takes to earn back a higher price.
Estimates use combined EPA ratings. Electric vehicles aren’t compared here because they don’t use gas. Your real mileage depends on how and where you drive.
How much does better gas mileage save?
Yearly gas cost by MPG
| MPG | 10,000 mi/yr | 12,000 mi/yr | 15,000 mi/yr |
|---|---|---|---|
| 20 mpg | $2,240 | $2,688 | $3,360 |
| 25 mpg | $1,792 | $2,150 | $2,688 |
| 30 mpg | $1,493 | $1,792 | $2,240 |
| 35 mpg | $1,280 | $1,536 | $1,920 |
| 40 mpg | $1,120 | $1,344 | $1,680 |
| 50 mpg | $896 | $1,075 | $1,344 |
At $4.48 a gallon, the U.S. average for regular (EIA, late September 2026).
Why a few MPG matter more for low-MPG cars
This is the part of fuel economy that surprises almost everyone. Going from 15 to 20 mpg saves more gas than going from 40 to 50 mpg. Over 12,000 miles, the first switch saves 200 gallons, about $866 a year at $4.33 a gallon; the second saves only 60 gallons, about $260. If you’re replacing a truck or large SUV, even a small MPG gain is worth a lot. That’s why the U.S. government’s fuel economy labels show the yearly fuel cost as well as MPG.
Is a hybrid worth it?
Use the “extra price” box above. Enter how much more the hybrid costs than the regular version, and the calculator shows how many years of gas savings it takes to earn that back. As a hypothetical example: if a hybrid gets 45 mpg instead of 30 and costs $3,000 more, a driver doing 12,000 miles a year saves about 133 gallons, or roughly $577 a year at $4.33. That’s a payback of a little over five years. Hybrids save the most in city and stop-and-go driving.
When a more efficient car pays off
My rule is to start with how long you keep cars and how much you drive. If you drive a lot and keep your cars for many years, paying more for better mileage usually makes sense, especially when gas is as expensive as it is this year. If you drive little or trade in often, the savings may never catch up with the higher price.
And if you’re replacing a low-MPG vehicle, don’t underestimate the gain: the first few miles per gallon you add are the most valuable ones. — Nathan Brooks
Quick answers
How do I calculate how much I’ll save with better gas mileage?
Work out each car’s yearly gallons (miles ÷ MPG), multiply by the price of gas and subtract. Example: 12,000 miles at $4.48 costs $2,240 at 24 mpg and $1,536 at 35 mpg, so you save about $704 a year.
Where does the MPG come from?
When you pick a car, we load its official combined rating from FuelEconomy.gov, run by the U.S. Department of Energy and EPA.
Does the calculator work for electric cars?
No, it compares gas mileage only. Electric vehicles don’t use gasoline, so their costs depend on electricity prices.
How many miles does the average American drive a year?
Roughly 12,000 to 13,500 miles, but it varies a lot by person and state. Enter your own number for the most accurate result.
Keep saving
Sources
FuelEconomy.gov web services (U.S. DOE/EPA) · FuelEconomy.gov: compare cars · EIA Gasoline and Diesel Fuel Update · FHWA Highway Statistics
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