* Engine specifics: The exact engine (e.g., 6.5L Detroit Diesel, different variations) will impact fuel economy.
* Vehicle condition: Proper maintenance (tune-ups, tire pressure, etc.) greatly affects MPG.
* Driving habits: Aggressive acceleration and high speeds drastically reduce fuel economy.
* Load: Towing or hauling heavy loads will significantly decrease MPG.
* Terrain: Hill and mountain driving reduces fuel economy.
Considering these variables, a reasonable estimate for a 1994 Chevy 3500 DRW diesel in good condition, driven conservatively, and *unloaded* might be in the range of 12-16 mpg. However, this could easily drop to 8-12 mpg or even lower under heavy loads or demanding driving conditions. Expect significantly lower figures if the truck is poorly maintained or the engine is worn.
