So do you regret the trade? I sold a yellow MGB when I was about 19 and saw it running around San Antonio for years and years after.
To answer your question honestly - yes and no. I don't miss the mileage, or lack thereof. 18 was the best I ever saw on the highway. Fr comparison, my diesel jeep gets 22 in town.
I do miss the H3 as a vehicle. It was fantastic to drive both on and off road, it had front and rear lockers, and always brought with it thumbs up. You see very few of them up here, even less in the Northwoods. And it was the actual last H3 to be built, excluding the Avis fleet order. The mystique and aura that surrounded it was almost magical. That being said, the jeep is a stellar riding vehicle, unbelievable power with equally unbelievable fuel economy(25.6 highway!). Fantastic navigation with iPhone intergration(factory), a far superior traction control system to the H3 and smooth as silk 5spd transmission. It does lack lockers, but it more than makes up for it with the traction control. And I miss the sunroof that the H3 had - it was like greenhouse inside.