FuelFacts

← all 1984 Oldsmobile Delta 88 trims

1984 Oldsmobile Delta 88 — 3.8L 6-cyl, Automatic 3-spd

This 1984 Oldsmobile Delta 88 (3.8L 6-cyl, Automatic 3-spd) takes regular (87-octane) gasoline. REGULAR

17
MPG combined (15 city / 20 hwy)
$3,353
est. fuel cost / year (today’s prices, 15k mi)
tailpipe CO₂

At today's AAA national average price ($3.80/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 Oldsmobile Delta 88 trims

TrimFuelMPGFuel/yr
3.8L 6-cyl, Automatic 3-spdREGULAR17$3,353
5.0L 8-cyl, Automatic 3-spdREGULAR16$3,562
5.0L 8-cyl, Automatic 4-spdREGULAR16$3,562
5.0L 8-cyl, Automatic 3-spdREGULAR16$3,562
5.0L 8-cyl, Automatic 4-spdREGULAR16$3,562
5.7L 8-cyl, Automatic 3-spdDIESEL21$3,414
5.7L 8-cyl, Automatic 4-spdDIESEL21$3,414

EPA fuel type: Regular · class: Large Cars · engine: 3.8L 6-cyl · transmission: Automatic 3-spd · MPG retrieved 2026-07-24.