We purchased our truck as a tool to tow our "Recreational" vehicle to different places. If we were concerned about fuel economy, and wasted time crunching numbers as to options, weights, etc. to get the "best" fuel efficient vehicle, then owning an RV would not be as enjoyable. We may not even have gotten into RVing. Fuel, whether diesel or gasoline, is a necessary evil of owning an RV. We purchased the truck that gives us what we need, with the options we wanted. We don't carry a calculator to determine MPG. We don't worry about what speed is most fuel efficient. When the tank gets low on fuel we stop and fill up and pay. We are by no means wealthy. But we know that the price of fuel is small compared to what was spent to purchase the RV and the tool to tow it. We look forward to the next destination, not how much fuel it takes to get there. JOHO