1984 Buick Regal — 4.3L 6-cyl, Automatic 4-spd
This 1984 Buick Regal (4.3L 6-cyl, Automatic 4-spd) runs on diesel. DIESEL
At today's AAA national average price ($4.78/gal, 2026-07-05) — the EPA's own price/date assumption isn't exposed in the public dataset, so we recompute this from the EPA's MPG figure and a sourced current price.
This 1984 model was originally EPA-tested under the pre-2008 2-cycle method, which didn't account for highway speeds over 60 mph, air-conditioner use, or cold starts. When EPA overhauled the test for model year 2008, city ratings fell by about 12% and highway by about 8% on average industry-wide — and EPA retroactively adjusted every 1984-2007 rating to the stricter standard so old and new cars could be compared fairly. The MPG above is already on that modern scale — the window sticker on this car when it was new likely showed a higher, pre-2008-method number.
Other 1984 Buick Regal trims
| Trim | Fuel | MPG | Fuel/yr |
|---|---|---|---|
| 3.8L 6-cyl, Automatic 3-spd | REGULAR | 19 | $3,000 |
| 3.8L 6-cyl, Automatic 3-spd | REGULAR | 18 | $3,167 |
| 4.1L 6-cyl, Automatic 4-spd | REGULAR | 17 | $3,353 |
| 4.1L 6-cyl, Automatic 4-spd | REGULAR | 17 | $3,353 |
| 3.8L 6-cyl, Automatic 4-spd | REGULAR | 16 | $3,562 |
| 3.8L 6-cyl, Automatic 4-spd | REGULAR | 16 | $3,562 |
| 4.3L 6-cyl, Automatic 4-spd | DIESEL | 23 | $3,117 |
| 5.7L 8-cyl, Automatic 4-spd | DIESEL | 21 | $3,414 |
EPA fuel type: Diesel · class: Midsize Cars · engine: 4.3L 6-cyl · transmission: Automatic 4-spd · MPG retrieved 2026-07-24.