Porsche 928 S4 MPG by year — every rating on record
The Porsche 928 S4 has a combined EPA fuel economy rating for 4 model years, from 1988 to 1991. Across those years its best rated version returned 16 mpg (1988) and its thirstiest returned 14 mpg (1989). The EPA record holds 10 configurations for this nameplate, most recently a Minicompact Cars / Midsize Cars.
Year-by-year EPA ratings
| Model year | Configurations | Best combined | Worst combined | Class rank that year | Drivetrains | Fuel | EPA class |
|---|---|---|---|---|---|---|---|
| 1988 | 2 | 16 mpg | 16 mpg | #14 of 15 (7th pct) | Rear-Wheel Drive | Premium | Minicompact Cars |
| 1989 | 3 | 15 mpg | 14 mpg | #11 of 12 (9th pct) | Rear-Wheel Drive | Premium | Minicompact Cars |
| 1990 | 2 | 15 mpg | 14 mpg | #8 of 8 (0th pct) | Rear-Wheel Drive | Premium | Minicompact Cars |
| 1991 | 3 | 15 mpg | 14 mpg | #8 of 10 (22th pct) | Rear-Wheel Drive | Premium, Regular | Minicompact Cars, Midsize Cars |
Where it has stood in its class
Ranked against every other nameplate the EPA filed under the same class that year. The Porsche 928 S4 placed highest in 1990 at #8 of 8, and lowest in 1988 at #14 of 15. It spent 0 of its 4 ranked years in the top half of its class.
Every configuration on record
All 10 configurations EPA lists for this nameplate, newest first.
| Year | Configuration | Engine detail | City | Highway | Combined | Gallons/yr | Barrels/yr | EPA fuel cost/yr | CO2 g/mi | GHG |
|---|---|---|---|---|---|---|---|---|---|---|
| 1991 | 5.0L 8-cyl Rear-Wheel Drive Manual 5-spd Premium | (GUZZLER) (FFS) | 11 | 18 | 14 | 821.4 | 21.3 | $5,550 | 634.7857142857143 | n/a |
| 1991 | 5.0L 8-cyl Rear-Wheel Drive Automatic 4-spd Premium | (GUZZLER) (FFS) | 14 | 17 | 15 | 766.7 | 19.8 | $5,150 | 592.4666666666667 | n/a |
| 1991 | 4.9L 8-cyl Rear-Wheel Drive Automatic 4-spd Regular | (GUZZLER) (FFS) | 14 | 18 | 15 | 766.7 | 19.8 | $4,150 | 592.4666666666667 | n/a |
| 1990 | 5.0L 8-cyl Rear-Wheel Drive Manual 5-spd Premium | (GUZZLER) (FFS) | 11 | 18 | 14 | 821.4 | 21.3 | $5,550 | 634.7857142857143 | n/a |
| 1990 | 5.0L 8-cyl Rear-Wheel Drive Automatic 4-spd Premium | (GUZZLER) (FFS) | 14 | 17 | 15 | 766.7 | 19.8 | $5,150 | 592.4666666666667 | n/a |
| 1989 | 5.0L 8-cyl Rear-Wheel Drive Manual 5-spd Premium | (GUZZLER) (FFS) | 11 | 18 | 14 | 821.4 | 21.3 | $5,550 | 634.7857142857143 | n/a |
| 1989 | 5.0L 8-cyl Rear-Wheel Drive Automatic 4-spd Premium | (GUZZLER) (FFS) | 14 | 17 | 15 | 766.7 | 19.8 | $5,150 | 592.4666666666667 | n/a |
| 1989 | 5.0L 8-cyl Rear-Wheel Drive Manual 5-spd Premium | (GUZZLER) (FFS) | 13 | 20 | 15 | 766.7 | 19.8 | $5,150 | 592.4666666666667 | n/a |
| 1988 | 5.0L 8-cyl Rear-Wheel Drive Automatic 4-spd Premium | (GUZZLER) (FFS) | 15 | 20 | 16 | 718.8 | 18.6 | $4,850 | 555.4375 | n/a |
| 1988 | 5.0L 8-cyl Rear-Wheel Drive Manual 5-spd Premium | (GUZZLER) (FFS) | 14 | 21 | 16 | 718.8 | 18.6 | $4,850 | 555.4375 | n/a |
How the rating has moved between model years
Comparing the best-rated configuration of each year. 0 of 1 year-over-year steps improved the top rating.
| Change | Best combined | Delta | Gallons a year at the newer rating |
|---|---|---|---|
| 1988 → 1989 | 16 → 15 mpg | -1 mpg | 767 gal |
What 928 S4 fuel costs over a year
At the EPA's 11,500 miles a year, the 1991 Porsche 928 S4 burns 767 to 821 gallons depending on configuration. Below is what that costs at three pump prices, and how much more the thirstiest configuration costs than the most efficient one.
| Pump price | Most efficient | Thirstiest | Spread |
|---|---|---|---|
| $3.00/gal | $2,300 | $2,464 | $164 |
| $3.50/gal | $2,683 | $2,875 | $192 |
| $4.00/gal | $3,067 | $3,286 | $219 |
EPA’s own estimate for the 1991 model year is $4,150 to $5,550 a year in fuel, or $14,500 more than the average new vehicle over five years.
How it compares with other Minicompact Cars
Across the 153 nameplates EPA classifies as Minicompact Cars, the median best combined rating is 21 mpg. At 15 mpg the Porsche 928 S4 is 6 mpg below the median, which is worth about $767 a year at $3.50 a gallon.
- All Minicompact Cars rankings — every nameplate in the class, best to worst.
Other Porsche nameplates
Every Porsche model compared → — all nameplates ranked by best combined rating, with what each one costs a year.