A Rolls-Royce Ghost carries $2,600 of federal gas guzzler tax. A Rolls-Royce Cullinan, measured by the same agency at the identical 18.2 miles per gallon, carries none. One is a car and the other is a sport utility vehicle, and in model year 2026 that is the whole of the difference between them.
How this was computed, and the trap in the mileage figure
Two free primary sources make this measurable and neither answers it alone. The rate schedule is statutory: section 4064 of the Internal Revenue Code sets eleven bands running from $1,000 to $7,700, reprinted by the IRS on IRS Form 6197, revised October 2023 and read on 30 August 2026. The fuel economy is EPA’s, published in its full vehicle file at fueleconomy.gov, 50,242 rows covering model years 1984 to 2027 and read the same day. That file flags which vehicles are liable but never states the amount, so no government page tells a buyer what a particular car owes. Rich & Richer joined the two.
The trap is the mileage figure, and it is large enough to invalidate the whole exercise if missed. The tax is not assessed on the window sticker. It runs on the combined unadjusted laboratory economy, weighted 55 percent city against 45 percent highway, which comes out roughly a quarter above the sticker number. The Ghost reads 14 mpg on the sticker and 18.2 unadjusted. Banding the sticker figure would push almost every car here several bands too deep and overstate its bill by thousands of dollars.
Liability is EPA’s call. The arithmetic was checked against it.
Liability is EPA’s determination rather than ours. Whether a vehicle owes the tax is read off the agency’s own flag, and the arithmetic supplies only the amount. As a check, banding the computed figure reproduced that flag on 428 of 429 model year 2026 passenger cars. The one disagreement is a Genesis G80 a tenth of a mile per gallon inside the exemption line, where the tax is assessed on a model type averaged across configurations rather than on the single one this file records.
The rounding was chosen by measurement rather than by taste. Rounding the computed figure to one decimal reproduced EPA’s flag on 428 cars; leaving it unrounded, and rounding it to a whole number, each agreed on two fewer. What that check establishes is narrow and worth stating narrowly: it confirms that the arithmetic used here lands cars in the same place the agency does, which is what licenses printing a dollar amount next to a car’s name. It does not verify EPA’s measurements, and it says nothing about what any individual manufacturer actually remitted, which is filed quarterly on Form 720 and not published car by car.
The 33 model year 2026 cars that pay
| Car | Combined unadjusted mpg | Sticker mpg | Gas guzzler tax |
|---|---|---|---|
| Ford Mustang GTD | 15.6 | 12 | $3,700 |
| Ferrari Purosangue | 15.7 | 12 | $3,700 |
| Chevrolet Corvette Z06 Carbon Aero | 17.0 | 14 | $3,000 |
| Chevrolet Corvette ZR1 | 17.1 | 14 | $3,000 |
| Chevrolet Corvette ZR1X | 17.4 | 14 | $3,000 |
| Chevrolet Corvette Z06 | 17.8 | 15 | $2,600 |
| Ferrari 12Cilindri Spider | 17.8 | 14 | $2,600 |
| BMW M5 Touring | 17.9 | 13 | $2,600 |
| Ferrari 12Cilindri | 18.1 | 14 | $2,600 |
| Rolls-Royce Phantom | 18.2 | 14 | $2,600 |
| Rolls-Royce Phantom Extended | 18.2 | 14 | $2,600 |
| Rolls-Royce Ghost | 18.2 | 14 | $2,600 |
| Rolls-Royce Ghost Extended | 18.2 | 14 | $2,600 |
| Rolls-Royce Ghost Black Badge | 18.2 | 14 | $2,600 |
| Cadillac CT5 V | 18.3 | 15 | $2,600 |
| Mercedes-Benz Maybach S680 4matic | 18.5 | 15 | $2,100 |
| BMW M5 Sedan | 18.8 | 14 | $2,100 |
| Car | Combined unadjusted mpg | Sticker mpg | Gas guzzler tax |
|---|---|---|---|
| Porsche 911 GT3 Touring | 19.7 | 15 | $1,700 |
| Aston Martin Vanquish Volante | 20.0 | 16 | $1,700 |
| Porsche 911 GT3 | 20.0 | 15 | $1,700 |
| Aston Martin Valhalla | 20.1 | 16 | $1,700 |
| Mercedes-Benz SL680 Maybach | 20.3 | 16 | $1,700 |
| Aston Martin Vanquish | 20.4 | 16 | $1,700 |
| Mercedes-Benz AMG GT 55 4matic Plus (coupe) | 20.4 | 16 | $1,700 |
| Mercedes-Benz AMG GT 63 4matic Plus (coupe) | 20.4 | 16 | $1,700 |
| Mercedes-Benz AMG GT 63 PRO 4matic Plus (coupe) | 20.4 | 16 | $1,700 |
| Audi RS 7 | 20.4 | 16 | $1,700 |
| Audi RS 6 Avant | 20.4 | 16 | $1,700 |
| Mercedes-Benz AMG SL63 4matic Plus | 20.5 | 16 | $1,300 |
| Mercedes-Benz AMG SL55 4matic Plus | 20.5 | 16 | $1,300 |
| Ford Mustang Dark Horse | 21.2 | 17 | $1,300 |
| Ferrari F80 | 21.5 | 17 | $1,000 |
| Aston Martin DB12 S | 21.7 | 17 | $1,000 |
The heaviest bill in model year 2026 is $3,700, which is four bands short of the $7,700 the statute allows for a car under 12.5 mpg. Nothing sold as a 2026 passenger car is thirsty enough to reach the top of a schedule written in 1978, and that is a fair measure of how much engines improved while the bands stood still.
61 untaxed models are inside the schedule and pay nothing
The exemption is the part worth understanding, because it is now larger than the tax. Running the same arithmetic across every model year 2026 vehicle EPA did not flag turns up 68 configurations, covering 61 distinct models, inside the statutory bands. That is against 33 models that pay. They owe nothing, and they are correct to owe nothing: section 4064(b)(1) defines an automobile as a four-wheeled vehicle rated at 6,000 lb unloaded gross weight or less, and the Environmental Protection Agency administers the tax as reaching passenger cars only. Those body styles were rare as private vehicles when Congress wrote the Energy Tax Act of 1978.
| Vehicle | EPA class | Combined unadjusted mpg | Would owe, if a car |
|---|---|---|---|
| Ram 1500 4WD | Standard Pickup Trucks 4WD | 15.0 | $4,500 |
| Ford F150 RAPTOR R 4WD | Standard Pickup Trucks 4WD | 15.1 | $4,500 |
| Cadillac Escalade V AWD | Standard Sport Utility 4WD | 17.1 | $3,000 |
| Dodge Durango AWD | Standard Sport Utility 4WD | 17.1 | $3,000 |
| Jeep Wrangler 4dr 4WD | Small Sport Utility 4WD | 17.9 | $2,600 |
| BMW XM Label | Standard Sport Utility 4WD | 18.0 | $2,600 |
| Rolls-Royce Cullinan | Standard Sport Utility 4WD | 18.2 | $2,600 |
| Rolls-Royce Cullinan Black Badge | Standard Sport Utility 4WD | 18.2 | $2,600 |
| Mercedes-Benz AMG G63 | Standard Sport Utility 4WD | 18.6 | $2,100 |
| BMW X5 M Competition | Standard Sport Utility 4WD | 19.0 | $2,100 |
| BMW X6 M Competition | Standard Sport Utility 4WD | 19.0 | $2,100 |
| Mercedes-Benz GLS600 4matic Maybach | Standard Sport Utility 4WD | 19.3 | $2,100 |
The Ghost pays $2,600. The Cullinan, at the same mpg, pays nothing.
One manufacturer makes the point without any argument attached. The Rolls-Royce Ghost and the Rolls-Royce Cullinan both return 18.2 miles per gallon combined unadjusted in EPA’s 2026 file, and both read 14 mpg on the sticker. The Ghost is classed as a large car and carries $2,600. The Cullinan is classed as a standard sport utility vehicle and carries nothing. Same maker, same measured consumption, same fuel burned per mile, and a tax that applies to one of them.
The inversion runs further than a single pair. A Ford F150 RAPTOR R 4WD returns 15.1 mpg and pays nothing, while a Porsche 911 GT3 Touring returns 19.7 mpg, uses materially less fuel over the same distance, and pays $1,700. A tax written to discourage fuel consumption now charges the more economical of those two vehicles and exempts the other.
What this does not cover
It covers one federal excise tax on one model year. State taxes and registration are separate charges, as are insurance and the fuel itself, and none of them is here. The tax is levied on the manufacturer or importer rather than charged to the buyer at the counter, so whether it reaches a window sticker as a separate line depends on the seller; section 4064 makes the maker liable, not the driver. Nothing here is tax advice.
The model list is also specific to model year 2026 and will move next year, which is why every caption carries the year and the date the file was read. The mechanism will not move: the bands have stood unchanged since 1991 and the body-style exemption has never been amended. For what these cars sell for rather than what they are taxed, this desk has measured what each generation of 911 sells for, and the standing reference for the rest of the cost is what a classic car costs to own.
This piece is part of our motoring reference, What a Classic Car Costs to Own: Realized Prices, and the Odds of Selling It, which sets out the method and collects every figure we have published on the subject. Also in it: Every Valuation Guide Tells You What a Classic Car Is Worth. None Tells You the Odds of Selling It., The Porsche 911 Depreciates Backwards. The 964 Costs More Than the 993., The Ferrari F355 Costs More Than the 360 That Replaced It. Five Models, by What They Actually Sold For., The E30 M3 Makes $63,250 at Auction. The E36 Makes $27,750. Same Badge., 11 Classic Cars Under $50,000, Ranked by Whether They Actually Sell, No-Reserve Classic Car Lots Sold 122 Times Out of 123. Within the Same Model, They Sold for a Fifth Less..
Sources
Rate schedule: 26 U.S.C. section 4064(a), as reprinted on IRS Form 6197 (Rev. October 2023), read by Rich & Richer on 30 August 2026. Eleven bands run from $1,000 for a car at 21.5 to 22.5 mpg to $7,700 for one below 12.5 mpg, with cars at 22.5 mpg and above exempt. The body-style exemption is in section 4064(b)(1) and the Environmental Protection Agency states its administrative effect at epa.gov/fueleconomy/gas-guzzler-tax.
Fuel economy: the EPA vehicle file at fueleconomy.gov, 50,242 rows covering model years 1984 to 2027, read 30 August 2026. It carries a liability flag but no dollar amount. Which vehicles are liable is taken from that flag; the amounts and the counterfactual column are Rich & Richer’s banding of EPA’s combined unadjusted figure, weighted 55 percent city against 45 percent highway and rounded to one decimal. That method reproduced EPA’s own flag on 428 of 429 model year 2026 passenger cars, and the rounding was chosen because unrounded and whole-number rounding each agreed on two fewer.
Frequently asked questions
Which cars pay the gas guzzler tax in 2026?
33 distinct models, according to the Environmental Protection Agency’s own liability flag on its model year 2026 vehicle file, read 30 August 2026. The heaviest bills are $3,700 on the Ford Mustang GTD and on the Ferrari Purosangue. Several Chevrolet Corvette variants sit at $3,000, and the Rolls-Royce Ghost and Phantom at $2,600. The lightest band on the list is $1,000.
Do SUVs and trucks pay the gas guzzler tax?
No. Section 4064(b)(1) defines an automobile for this tax as a four-wheeled vehicle rated at 6,000 lb unloaded gross weight or less, and EPA administers it as reaching passenger cars only, because trucks and sport utility vehicles were rarely private vehicles when the Energy Tax Act passed in 1978. In model year 2026 that exemption covers 68 vehicle records whose measured economy falls inside the statutory bands, against 37 that are taxed.
How much is the gas guzzler tax, and how is it calculated?
It is a flat amount per car set by band, not a percentage of the price, so it takes no account of what the car costs. Section 4064 lists eleven bands: $1,000 at 21.5 to 22.5 mpg, rising through $2,600 at 17.5 to 18.5 mpg, to $7,700 below 12.5 mpg, with anything at 22.5 mpg and above exempt. The mileage that decides the band is the combined unadjusted laboratory figure rather than the window sticker, and the gap between the two is wide: the Rolls-Royce Ghost reads 14 mpg on the sticker against 18.2 unadjusted, which is a difference of four statutory bands. Because the charge is flat rather than proportional, it behaves like the boat tax caps this desk measured in boat sales tax, where four of five states cap the bill: the more expensive the vehicle, the smaller the bill looks against its price.