Buick averages 21.8 mpg combined across 25 petrol and diesel models (1984–2026). The best on record does 31 mpg, the thirstiest 15 — a yearly fuel gap of about $1,321.
What that actually costs
What a Buick costs to feed, at 12,000 miles a year and $3.20 a gallon.
| Measure | Value |
|---|---|
| Average combined | 21.8 mpg |
| Fuel per year | $1,761 |
| Most frugal on record | 31 mpg — $1,239 a year |
| Thirstiest on record | 15 mpg — $2,560 a year |
Buick models by gas mileage
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 |
|---|---|---|---|
| Buick Encore GX | 31 / 30 | $1,267 | |
| Buick Envista | 30 / 30 | $1,280 | |
| Buick Encore | 30 / 27 | $1,333 | |
| Buick Skyhawk | 27 / 26 | $1,460 | |
| Buick Envision | 26 / 22 | $1,548 | |
| Buick Verano | 25 / 24 | $1,587 | |
| Buick Regal TourX | 24 / 24 | $1,600 | |
| Buick Cascada | 24 / 23 | $1,634 | |
| Buick LaCrosse | 29 / 19 | $1,648 | |
| Buick Regal | 29 / 18 | $1,730 | |
| Buick Somerset | 25 / 20 | $1,745 | |
| Buick Century | 27 / 20 | $1,753 | |
| Buick Skylark | 25 / 19 | $1,761 | |
| Buick Allure | 21 / 19 | $1,882 | |
| Buick Park Avenue | 21 / 19 | $1,901 | |
| Buick Enclave | 23 / 18 | $1,920 | |
| Buick LeSabre | 21 / 17 | $1,959 | |
| Buick Reatta | 20 / 19 | $1,969 | |
| Buick Rendezvous | 20 / 19 | $1,969 | |
| Buick Riviera | 21 / 15 | $1,979 | |
| Buick Lucerne | 21 / 18 | $2,010 | |
| Buick Terraza | 19 / 18 | $2,043 | |
| Buick Electra | 21 / 17 | $2,053 | |
| Buick Roadmaster | 18 / 17 | $2,169 | |
| Buick Rainier | 17 / 16 | $2,356 |
MPG is a number. Dollars per year is the answer.
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How we count
Buick rests on 322 EPA ratings covering 25 models from 1984 to 2026. The laboratory numbers are EPA's and go in unchanged; the money is ours, at 12,000 miles a year and $3.20 a gallon. Full method.
Frequently asked questions
What is the average Buick gas mileage?
21.8 mpg combined across 25 models and 322 EPA ratings, from 1984 to 2026 — 42 model years in one figure, which is why it sits below what a new Buick does today.
Which Buick model is the most economical?
The Buick Encore GX at 30.3 mpg, about $1,267 a year in fuel, against the Rainier at 16.3 mpg and $2,356 — a gap of $1,089 a year between the two ends of the same badge.
How much does a Buick cost to run?
About $1,761 a year in fuel, at 12,000 miles and $3.20 a gallon. Over five years that is $8,805, before a single service.
Why does the Buick average look low?
Because it spans 42 model years, back to 1984. Cars built before the mid-2000s were markedly thirstier, and Buick has 322 ratings from that whole stretch — the recent ones are pulled down by the old.
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