Porsche 928 S4 MPG and Fuel Economy
Porsche have been manufacturing models of 928 S4 for 4 years, with the latest vehicle in 1991 having a combined MPG of 15.
The estimated fuel cost for the 1991 Porsche 928 S4 is $4,950 per year.
Government regulators have estimated that value based on 15,000 miles driven per year, using regular gasoline, and a split of 55% city driving and 45% highway driving.
💵 Compared to an average vehicle over 5 years, you will spend $13,250 more on fuel driving a 1991 Porsche 928 S4.
🛢 The Porsche 928 S4 will consume roughly 20 barrels of petroleum per year, using the standard estimate of 15,000 miles per year.
💨 For every mile driven, the Porsche 928 S4 will emit -1 grams of CO2, which is about -15,000 grams of CO2 per year.
🌳 To help you understand the impact of this, a normal tree will absorb around 21,000 grams of CO2 per year. This means that roughly 1 tree would be needed to offset emissions from the Porsche 928 S4.
The table below is a complete list of the 4 Porsche 928 S4 fuel efficiency specifications we have data for.
Click any vehicle link to see a more detailed breakdown of the car, miles per gallon, emissions, and more.
| Vehicle | Combined MPG | Fuel Cost |
|---|---|---|
| 1991 Porsche 928 S4 | 15 | $4,950 |
| 1990 Porsche 928 S4 | 15 | $4,950 |
| 1989 Porsche 928 S4 | 15 | $4,950 |
| 1988 Porsche 928 S4 | 16 | $4,600 |
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"Porsche 928 S4 MPG and Fuel Economy." MPG Buddy. Accessed on January 3, 2026. https://mpgbuddy.com/cars/porsche/928-s4.
"Porsche 928 S4 MPG and Fuel Economy." MPG Buddy, https://mpgbuddy.com/cars/porsche/928-s4. Accessed January 3, 2026.
Porsche 928 S4 MPG and Fuel Economy. MPG Buddy. Retrieved from https://mpgbuddy.com/cars/porsche/928-s4.