* Driving style: Aggressive acceleration and high speeds drastically reduce fuel economy. Gentle acceleration and maintaining a consistent speed will improve it.
* Vehicle weight: A heavier truck (added weight from modifications, cargo, etc.) will get worse fuel mileage.
* Tire size: Larger tires can affect the speedometer and odometer readings, leading to inaccurate fuel economy calculations. They also increase the rolling resistance, reducing fuel economy.
* Terrain: Driving uphill, in stop-and-go traffic, or off-road significantly impacts fuel economy.
* Maintenance: Proper maintenance (clean air filter, properly inflated tires, well-maintained engine) is crucial for optimal fuel economy.
* Modifications: Engine modifications (tuning, exhaust systems, etc.) can significantly impact fuel economy, either positively or negatively.
While a *general* range might be given (say, 15-20 mpg highway, significantly less in city driving), this is just a broad estimation. Many trucks with this setup will fall outside of that range due to the factors listed above.
To get a better idea of expected fuel economy for *your* specific truck, you should:
* Consult your owner's manual: It may provide fuel economy estimates under specific conditions.
* Check online forums: Search for forums dedicated to Dodge Cummins trucks. Owners with similar setups often discuss their real-world fuel economy. Be mindful that these are anecdotal and may not be entirely representative.
* Use a fuel log: Track your fuel-ups over several tanks to get an accurate average for your driving habits and conditions.
In short, don't rely on a single number. Consider the various factors involved and use multiple resources to get a better understanding of what to expect for your truck.
