Cadillac averages 21.7 mpg combined across 32 models (1984–2026). The best on record does 105 mpg, the thirstiest 13 — a yearly fuel gap of about $2,588.
What that actually costs
What a Cadillac costs to feed, at 12,000 miles a year and $3.20 a gallon.
| Measure | Value |
|---|---|
| Average combined | 21.7 mpg |
| Fuel per year | $1,770 |
| Most frugal on record | 105 mpg — $366 a year |
| Thirstiest on record | 13 mpg — $2,954 a year |
Cadillac models by fuel economy
From the most frugal down. The yearly figure is what the fuel actually costs at 12,000 miles.
| Model | Average mpg | Best / Worst engine | Fuel per year |
|---|---|---|---|
| Cadillac Optiq | 105 / 105 | $366 | |
| Cadillac Lyriq | 92 / 89 | $424 | |
| Cadillac Vistiq | 86 / 86 | $447 | |
| Cadillac Celestiq | 81 / 81 | $474 | |
| Cadillac Escalade IQL | 81 / 81 | $474 | |
| Cadillac Escalade IQ | 81 / 81 | $474 | |
| Cadillac ELR | 33 / 32 | $1,174 | |
| Cadillac XT4 | 26 / 26 | $1,477 | |
| Cadillac ATS | 26 / 22 | $1,580 | |
| Cadillac CT4 | 27 / 19 | $1,641 | |
| Cadillac CT6 | 28 / 17 | $1,707 | |
| Cadillac XT5 | 24 / 21 | $1,714 | |
| Cadillac Cimarron | 25 / 19 | $1,722 | |
| Cadillac CT5 | 27 / 15 | $1,753 | |
| Cadillac XT6 | 23 / 20 | $1,761 | |
| Cadillac XTS | 22 / 21 | $1,794 | |
| Cadillac CTS | 25 / 16 | $1,930 | |
| Cadillac Fleetwood | 24 / 17 | $2,032 | |
| Cadillac STS | 21 / 18 | $2,032 | |
| Cadillac Eldorado | 21 / 17 | $2,098 | |
| Cadillac Seville | 21 / 17 | $2,098 | |
| Cadillac Deville | 19 / 17 | $2,110 | |
| Cadillac Catera | 19 / 18 | $2,110 | |
| Cadillac DTS | 18 / 18 | $2,133 | |
| Cadillac XLR | 18 / 18 | $2,133 | |
| Cadillac Brougham | 18 / 17 | $2,157 | |
| Cadillac SRX | 21 / 16 | $2,182 | |
| Cadillac Escalade | 23 / 13 | $2,233 | |
| Cadillac 60 Special | 17 / 16 | $2,356 | |
| Cadillac Allante | 17 / 15 | $2,385 | |
| Cadillac Hearse | 19 / 14 | $2,430 | |
| Cadillac Escalade ESV | 17 / 13 | $2,595 |
MPG is a number. Dollars per year is the answer.
- Fuel profile built from your actual mileage and local prices
- Fuel tracker: what you really spend, month by month
- Insurance and fuel folded into 5-year cost to own
- Compare any two cars on total cost, not sticker price
- No ads, no tracking — and much more
How we count
Fuel-economy figures come from EPA fueleconomy.gov — the same laboratory numbers printed on the window sticker. We don't adjust them; real-world consumption depends on how and where you drive.
What we add is money. Yearly cost assumes 12,000 miles at $3.20 a gallon — change either and the ranking stays, only the size of the bill moves. Cost per mile is the same figure divided out, useful when comparing a commute against a weekend car.
Frequently asked questions
What is the average Cadillac mpg?
21.7 mpg combined across 32 models rated between 1984 and 2026. That averages everything the brand has offered, so a long history of trucks pulls it down.
Which Cadillac model is the most economical?
See the table above — models are sorted from the most frugal down, with what each costs in fuel per year.
How much does a Cadillac cost to run?
About $1,770 a year in fuel on average, at 12,000 miles and $3.20 a gallon.
Why does the average look low for a modern brand?
Because it covers every model year on record, back to the 1980s. Cars built before the mid-2000s were markedly thirstier — that era is included.