* Engine size: The Dakota came with a range of engines (e.g., 2.5L 4-cylinder, 3.9L V6, 5.2L V8). Smaller engines generally get better mileage.
* Transmission: Automatic or manual transmissions impact fuel economy. Manuals tend to be slightly more efficient.
* Driving habits: Aggressive driving significantly reduces fuel economy.
* Vehicle condition: Proper maintenance (tune-ups, tire pressure, etc.) improves mileage.
* Payload and towing: Hauling heavy loads or towing a trailer dramatically reduces gas mileage.
Therefore, it's impossible to give a single MPG figure. However, you can expect a range from the low teens (mpg) for a V8 with a heavy load to perhaps the mid-twenties for a 4-cylinder with a light load and careful driving. Expect somewhere between 15-25 MPG, but likely closer to the lower end of that range in typical use.
To get a more precise estimate for a specific 1991 Dodge Dakota, you'd need to know the exact engine and transmission and consult a resource like the EPA's fuel economy website (though data for that specific year may be limited). You can also find some information on used car sites, though user-reported figures should be taken with a grain of salt.
