Depends on where the financing is.
T660 is paid for. If it weren't for concerns with reman parts due to being a glider, and more importantly me deciding I need something with more room to move and work inside, I wouldn't be getting rid of it.
That, and I can't get into California without worrying about CARB. Not to mention, brokers are starting to check for CARB certification more and more.
Lifetime fuel economy is over 7, current 90 day average is 7.23, and that is running 67+ virtually everywhere it's legal.
I'm doing what makes sense right now by upgrading into a new truck.
If the freight market stays good, I will have the truck paid off early. That allows me to keep the truck indefinitely, basically until it is no longer cost effective due to breakdowns and lost revenue.
I was two unexpected major repairs from being able to pay the T660 off in three years.
Biggest mistake I made out here was not keeping my original lease purchase 2012 Cascadia at Schneider. It was a year old when I got it, I had it for a year, and I could have easily paid it off running it one more year. Live and learn.