* Specific engine: Even within V6 and V8 categories, different engine sizes and configurations existed. The 1991 Camaro offered several V6 and V8 options with varying displacements and power outputs. A larger V8 will naturally get worse gas mileage than a smaller V8 or a V6.
* Driving habits: Aggressive acceleration, high speeds, and frequent idling significantly impact fuel economy.
* Vehicle condition: Proper maintenance (tune-ups, tire pressure) contributes to better mileage.
* Transmission type: Automatic vs. manual transmissions will affect fuel economy.
* Tire size and condition: Larger tires and under-inflated tires reduce gas mileage.
You'd need to consult specific fuel economy figures for the *exact* engine configurations of the two Camaros being compared. You might find some information in owner's manuals or through online resources specializing in classic car specifications, but even then, the figures will represent ideal conditions and may not reflect real-world driving. Expect the V8 to have significantly lower fuel economy than the V6.