Recommended Free Tools
Sometimes—but there is no universal break-even point. A fuel-efficient car is financially worthwhile when the present value of the fuel it is likely to save over your ownership period exceeds its actual price premium. Because future gasoline prices are uncertain, compare several price scenarios rather than relying on one forecast.
What determines whether the extra efficiency pays off?
The answer depends on four inputs: the more efficient car’s extra purchase cost, the vehicles’ fuel economy, how much you drive, and how long you keep the car. Fuel prices affect the result, but they are only one part of it. Compare vehicles with similar size, equipment, and features so you do not mistake the cost of an upgrade for the cost of better fuel economy.
- Higher annual mileage generally means more potential fuel savings.
- A larger fuel-economy advantage generally increases savings, though MPG gains do not translate linearly into fuel saved.
- A longer ownership period gives savings more time to accumulate.
- A larger upfront premium makes the efficient car harder to justify financially.
Calculate fuel savings in gallons, then dollars
For each vehicle, estimate annual fuel use as annual miles driven divided by combined MPG. Multiply those gallons by a gasoline price to estimate annual fuel cost. The difference between the two vehicles’ costs is the estimated annual fuel savings.
- Find combined MPG for each exact model year and trim. EPA fuel-economy figures appear on new-vehicle labels and can be compared through fueleconomy.gov. A vehicle’s actual fuel use varies with mileage and driving conditions.
- Estimate annual miles. Use your own expected driving, not a generic average, if you have a reliable estimate.
- Calculate gallons per year. Divide annual miles by each vehicle’s combined MPG.
- Multiply by each gasoline-price scenario. This gives an estimated annual fuel cost for each car.
- Subtract the efficient car’s extra price from the value of its expected fuel savings. Compare prices for similarly equipped vehicles, and include financing differences if they apply to your actual deal.
For example, the EPA illustrates the arithmetic using 15,000 miles per year and gasoline at $3.50 per gallon: a 20-MPG vehicle would use 750 gallons and cost $2,625 per year in fuel, while a 50-MPG vehicle would use 300 gallons and cost $1,050. Those are illustrative figures, not current price estimates or a prediction for a particular driver.
#1 Best Overall
Why a five-MPG improvement can matter more at low MPG
MPG measures miles per gallon, so a given MPG change does not save the same amount of fuel at every starting point. At a low starting MPG, the vehicle uses substantially more gallons per mile; improving its efficiency can therefore cut more fuel use than the same MPG gain at a high starting point.
In an EPA illustration based on 15,000 miles per year and $3.50 per gallon, losing one MPG from 20 to 19 uses 39 additional gallons and costs $138 more per year. Losing one MPG from 50 to 49 uses six additional gallons and costs $21 more per year. The assumptions explain the comparison; these amounts are not universal costs.
Rank #2
- Ideal for Gifting
- Ideal for a bookworm
- Compact for travelling
A separate EPA 2014 review example estimated that moving from 20 to 25 MPG saved 120 gallons and $300 annually, assuming 12,000 miles per year and gasoline at $2.50 per gallon. It is a dated illustration of the method, not a current fuel-price estimate.
Test low, middle, and high gasoline-price scenarios
Rather than assume today’s price will persist, calculate the comparison using at least three plausible prices: a lower case, a central case, and a higher case. Use one price for both vehicles within each scenario, then compare the efficient car’s projected savings with its premium. You can use recent regional prices as a reference point, but a short-term forecast cannot establish gasoline prices across a multi-year ownership period.
Quick wins for a faster PC:
Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →The U.S. Energy Information Administration publishes weekly historical and current retail gasoline prices by region and monthly short-term outlooks. Check its gasoline price explainer for the relevant region and date. Treat its outlook as a near-term scenario input, not a guarantee for the full time you own a car.
Compare the premium with savings over your ownership period
Fuel savings in later years are not worth quite as much as money saved today. For a more careful comparison, estimate each year’s savings under your price scenarios, discount those future savings to present value, and compare the result with the efficient car’s actual price premium. A higher discount rate lowers the present value of future savings. The discount rate should reflect how you value money today versus money later; there is no single rate that fits every buyer.
Rank #4
An EPA 2014 review example valued a 20-to-25-MPG improvement over a 14-year median vehicle lifespan at $3,388 using a 3% discount rate, or $2,624 using a 7% rate. Those modeled values depend on that example’s assumptions and illustrate why the discount rate matters; they are not universal thresholds for deciding what premium to pay.
As a broad market finding—not a rule for an individual transaction—the EPA’s January 2019 research summary reported that recent panel studies found purchase prices reflected about 50% to 100% of future fuel expenses. The finding was conditional on static expectations for gasoline prices and discount rates of 5% to 6%. Your actual result can differ because your mileage, price expectations, vehicle choices, and ownership period may differ.
Best Value
- It can be a gift option
- Comes with secure packaging
- Helpful in various ways
Make the comparison specific to your purchase
Before deciding, assemble the inputs for both cars and run the same ownership period through each gasoline-price scenario:
- Actual out-the-door prices and the efficient car’s premium
- Combined MPG for the exact model years and trims
- Your expected annual mileage and years of ownership
- Low, central, and high gasoline-price assumptions
- A discount rate for future savings, if you are calculating present value
- Financing differences, if they apply to your deal
If the efficient option only comes out ahead in the high-price case, the decision depends on your willingness to accept that uncertainty. If it remains ahead under lower as well as higher assumptions, the financial case is less dependent on gasoline prices. If the premium exceeds the present value of savings across the scenarios you consider plausible, fuel economy alone does not justify paying that premium.
When the fuel-efficient car is more likely to be worth it
The financial case is strongest when you drive a lot, the MPG gap is substantial, and you expect to keep the car for several years. It is weaker when you drive relatively little, plan to sell soon, or would pay a large premium for the efficient option. A buyer may still prefer the higher-efficiency vehicle for reasons beyond fuel savings, but that is a separate value judgment from whether fuel savings repay the premium.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
