Dude I'm telling you even with no traffic there are some parts that you can't just go as fast on. I found myself being held up mostly in part to a great model motorist who parked their new BMW X6 at an angle and a few inches past the "No Standing Anytime" sign right where the bus turns on to Independence street...major PITA clearing the pivot point by only a few inches...after last night I can truly say that I have become a better driver lol.
As for the NG > O5...It's usually cause the senior guys who do those lines just don't like those buses and also the fact that there are a lot of elderly people who use those two lines which equates to it being more feasible to run a low floor on that route. IMO they (Orion V) are far better than the hybrids as they are more...."predictable" for lack of better a better term. They stop when you want them to stop, don't have a 2,000lbs battery on the roof so you can turn them at a decent speed with out getting a massive lean and possibly throwing the customers from one side of the bus to the other, acceleration is very good (subject to on par maintenance), responsive steering etc...