Lately, I like to build planes that are capable of flights around the entirety of Kerbin. I'm talking jets here, not space planes. I had an easy time of this in 19.0, but am having a bit of difficulty with it in 19.1. Before, I'd average a speed of about 1500m/s and would complete the trip in about 45 minutes. Now with the current version I am running out of fuel mid way through with similar designs I've used in the past. I know its a bit of bore, but do any of you do this? What designs do you use and what is your average speed and time?