Premium Fuel Will Cost You $8,012 Over Five Years

There's a number on every new-car window sticker that almost nobody reads. The EPA calculates what the car will cost you in fuel over five years compared with an average new vehicle, and prints it as a plus or a minus. Buy something thirsty and it's a minus. Buy something efficient and it's a plus.

I pulled that figure for every 2022-and-newer model in the EPA database and grouped it by what the car drinks.

Fifteen thousand dollars separates the top row from the bottom. That's not a rounding error on a car payment — that's a whole second car at the cheap end of the market.

Premium is the expensive one almost nobody budgets for

2,612 models require premium — nearly as many as run on regular. And they carry the second-worst five-year figure in the entire table: $8,012 behind average, at $3,802 a year.

Two things stack up to produce that. Premium engines tend to be bigger and more powerful, so they burn more. And every gallon costs 60 to 80 cents more than regular. Neither factor is dramatic on its own. Together, over five years and 75,000 miles, they add up to more than most people spend on a trim upgrade they agonised over.

The part that stings: this is not optional on those cars. Driving gently improves your mileage. It does not change the octane number printed inside the fuel flap. On a high-compression or turbocharged engine, the manufacturer's premium requirement is an engineering constraint, not a suggestion.

Diesel is worse than its reputation suggests

Diesel carries a fuel-economy halo — more miles per gallon, better torque, engines that run forever. The mpg part is true. The cost part isn't: $3,407 a year, $6,037 behind average, because diesel fuel itself is expensive and the vehicles that use it are heavy.

Which fits what we found in the used market, where a diesel F-250 asks $10,987 more than the gas version. You pay more to buy it and more to run it. It earns that back only if you genuinely tow.

The electric column, honestly

$852 a year and $6,740 ahead over five years. It's the biggest number in the table by a distance, and it's real — electricity per mile is genuinely cheap.

But read what it measures: fuel only. It says nothing about the purchase price, the battery, insurance or depreciation. We checked the price side separately and found most of the used-EV premium disappears once you filter for age and mileage — and the charging side has its own inconvenient truth, since average range stopped improving in 2019.

How to use this before you buy

Find the fuel requirement before the test drive, not after. It's printed on the original window sticker along with the EPA figures, and you can pull that sticker by VIN for any car — including a used one where the paperwork went in the bin years ago.

Then do the arithmetic on your own mileage. The EPA figures assume 15,000 miles a year. If you drive 7,000, halve everything: the premium penalty drops to about $4,000 over five years, and the calculus changes. If you drive 25,000, it gets worse than the table says.

One trap worth naming: "premium recommended" is not "premium required". Recommended means the engine makes its full rated power on premium but runs safely on regular with slightly less output. Required means the engine can be damaged on regular. That single word is worth eight thousand dollars, and it's in the owner's manual.