The Buick Roadmaster does 17.7 mpg combined (15 city, 23.1 highway), which works out to about $2,169 a year in fuel at $3.20 a gallon and 12,000 miles. Engine choice matters more than you'd think: 5.7L 8-cyl does 17.8 mpg while 5L 8-cyl Hybrid does 17.5 — a difference of $37 a year. Against other V8 cars it sits above the average of 16.1 mpg.
Every Buick Roadmaster engine, compared
Gas mileage on the Buick Roadmaster ranges from 17.8 down to 17.5 depending on which engine sits under the bonnet — a spread of $37 a year across 2 versions of the same car. Picking the right one often saves more fuel than picking a different car altogether. Yearly cost assumes 12,000 miles at $3.20 a gallon.
| Engine | Combined | City / Highway | Years | Fuel per year |
|---|---|---|---|---|
| 5.7L 8-cyl | 15 / 23.2 | 1992–1996 | $2,157 | |
| 5L 8-cyl Hybrid | 15 / 23 | 1991–1992 | $2,194 |
What that actually costs
The Buick Roadmaster burns a gallon every 17.7 miles, so 12,000 miles takes about 678 gallons a year. At $3.20 that is what the table below adds up to.
| Measure | Value |
|---|---|
| Cost per mile | $0.181 |
| Fuel per year | $2,169 |
| Fuel over five years | $10,845 |
| Against other V8 cars | −$216 a year |
| EPA's own estimate | $3,629 a year |
City or highway — who is this car for
The Buick Roadmaster gives up 8.1 mpg the moment you leave the motorway — 23.1 out there against 15 in town, a 54% drop worth $898 a year. A wide gap punishes stop-and-start traffic; a narrow one means the car doesn't care where you drive it.
| Measure | Value | Reading |
|---|---|---|
| City | 15 mpg | $2,560 a year if you only drive in town |
| Highway | 23.1 mpg | $1,662 a year if you mostly commute |
| Gap | +8.1 mpg (54%) | Wide — this car dislikes traffic |
How the Roadmaster changed over the years
The Roadmaster peaked in 1996 at 18 mpg (15 city, 24 highway) and was at its thirstiest in 1993 at 17 — 1 mpg apart, or $126 a year in fuel between buying one year and the other. The 1996 car does 18. Jumps usually mark a new generation or a new engine; dips often mean a heavier body or added all-wheel drive.
| Model year | Combined | City / Highway | Engines offered | Fuel per year |
|---|---|---|---|---|
| 1996 | 15 / 24 | 1 | $2,133 | |
| 1995 | 15 / 23 | 1 | $2,133 | |
| 1994 | 15 / 23 | 1 | $2,133 | |
| 1993 | 15 / 23 | 1 | $2,259 | |
| 1992 | 15 / 23 | 2 | $2,133 | |
| 1991 | 15 / 23 | 1 | $2,259 |
MPG is a number. Dollars per year is the answer.
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How we count
This page rests on 7 EPA ratings of the Buick Roadmaster — 2 engines across 1991–1996. The mileage is EPA's laboratory figure, unchanged; the yearly bill is ours, at 12,000 miles and $3.20 a gallon, against EPA's own estimate of $3,629. Full method.
Frequently asked questions
What mpg does the Buick Roadmaster get?
17.7 mpg combined on average — 15 in the city and 23.1 on the highway, per EPA ratings across 1991–1996.
How much does a Buick Roadmaster cost in fuel per year?
About $2,169 at 12,000 miles and $3.20 a gallon — roughly $10,845 over five years, or 0.181 dollars a mile.
Which Roadmaster engine is the most economical?
The 5.7L 8-cyl at 17.8 mpg, against 17.5 for the 5L 8-cyl Hybrid — a difference of about $37 a year.
Is the Roadmaster good on fuel compared with similar cars?
Against other V8 cars it sits above the average of 16.1 mpg, computed across 3323 ratings.
Are these real-world Roadmaster figures?
No — they are EPA laboratory ratings, the same ones printed on the window sticker, and EPA's own annual fuel estimate for the Buick Roadmaster is $3,629 against the $2,169 we compute at 12,000 miles. Expect a little worse in practice: the spread between the 18 and 17 mpg versions of this car is smaller than the spread between two drivers of the same one.
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