I'm Questioning Power/Torque of Gas vs Diesel

I'm no expert and don't really have the desire to become one. I just wanted a comfortable way to travel. In 2007 I bought a 32' Class A that was gas powered. It had the V-10 Tritan or Titan or something. I truly hated that thing. It would slow down on every little hill. I didn't keep it long and gave up on RVing. In 2013 I decided to give it another try and purchased an Era (Sprinter). Of course, it has a diesel. I have absolutely no idea of how many horses or how much torque it has. I don't care. It drives beautifully. It climbs hills with seemingly little effort. It has great acceleration. The view is wonderful. I would rather drive that Era down the highway than any other vehicle I have owned. I've had a few disappointments with the coach. I've been told I should have expected that. The last 5,000 miles have been trouble free. I now have 20,000 miles on it, mostly interstate at 70 mph because our sons live in the southeast and we live in the southwest. It has maintained 18.4 mpg from day one. I have no doubt the mileage would be better if I drove on more 55mph roads. I intend to do more of that this year. It climbs our mountains without effort. I have also towed our Suzuki GV. It pulled the Suzuki easily.