I did a flat 200K recently on my upwrong bike, I did 6:57. My best time on that route on my recumbent wss 7:10 and 7:26.
I have a hilly 300K coming up that I did in 13:56 on my recumbent and I was light and in good shape. I am curious to see what my time will be on the upwrong because I am 25 pounds heavier than when I did that route on the bent.
After something like 40,000 miles, I could climb as fast on the bent as an upright up to a certain gradient (7-8%). Where I was really slow was out of the hole on the bent. It took me forever to get back to speed. But on a road with no stops or better yet on a slightly rolling course, the bent is fast as stink. On my normal roads around here with stop signs and 50-60 feet of elevation gain per mile.
In terms of improvements, I was able to lower my bent cdA down from 0.200-210 to under 0.150 with body position, cleaning up the airflow in the bike, helmet, skinsuit, rear wheel cover, lower the seat, box, etc. It takes work to figure it out.