* Engine size: The 1993 Silverado offered several V8 engine options (e.g., 5.0L, 5.7L, 7.4L). Larger engines generally have lower fuel economy.
* Transmission: Automatic or manual transmissions affect fuel efficiency.
* Vehicle condition: Proper maintenance (tune-ups, tire pressure, etc.) significantly impacts MPG.
* Driving habits: Aggressive driving drastically reduces fuel economy.
* Payload and towing: Hauling heavy loads or towing reduces MPG.
* Terrain: Driving in hilly or mountainous areas lowers fuel economy.
Therefore, there's no single answer. However, you can expect city MPG to range from around 10-15 mpg, and highway MPG from 13-18 mpg. These are rough estimates, and the actual mileage will likely fall within this range or potentially outside it depending on the factors listed above. The larger the engine, the lower the MPG will generally be.
To get a more precise idea, you should consult the original owner's manual for the specific engine and configuration of your 1993 Silverado. You can also search online for used car listings of similar vehicles to see what fuel economy owners have reported.