* Early models (1984-1985) with the 2.5L Iron Duke engine: These were considerably slower, with a top speed likely around 90-100 mph and sluggish acceleration.
* Later models (1985-1988) with the 2.8L V6 engine: These were significantly faster. Top speed was closer to 110-120 mph, and acceleration was much improved. Specific numbers varied depending on the year and whether it was naturally aspirated or had optional performance upgrades.
Therefore, there's no single "speed" for a Pontiac Fiero. It depended heavily on the specific car's configuration.
